算数に強くなる!水道方式【水道方式とは何か】

算数を理解するための最善の方法

3位数÷1位数[商3位数](型分け)

3位数÷1位数では3つの素過程の複合になります。2位数÷1位数に複合の数が増加し、 \setstretch{0.8} \begin{array}{rcc} \ &\ &\hspace{-1em}\square\hspace{0.2em}0\square \\ \cline{2-3} \kern1em\square& \kern-0.6em {\big)} \kern0.1em & \hspace{-1em}\square\square\square \\ \end{array} \setstretch{0.8} \begin{array}{rcc} \ &\ &\hspace{-1em}\square\hspace{0.2em}0\square \\ \cline{2-3} \kern1em\square& \kern-0.6em {\big)} \kern0.1em & \hspace{-1em}\square\hspace{0.2em}0\square \\ \end{array} \setstretch{0.8} \begin{array}{rcc} \ &\ &\hspace{-1em}\square\hspace{0.2em}0\hspace{0.2em}0 \\ \cline{2-3} \kern1em\square& \kern-0.6em {\big)} \kern0.1em & \hspace{-1em}\square\hspace{0.2em}0\hspace{0.2em}0 \\ \end{array}などのような型が現れ、主要な問題点は全て網羅されます。
《たてる》⇒《かける》⇒《ひく》⇒《おろす》の手続きを全て踏む典型的な問題から、特殊退化型に進むように指導体系を維持するよう心がけます。
あまりの位置に\boxtimesの記号があるものは、便宜上あまりが0である場合を含むことを示しています。ただし、あまりが0(わりきれる型)の場合は独立した型となります。各右側の問題例では、わりきれる型を下段に示しています。

3位数÷1位数の指導

[1]水源地型 問題
 \setstretch{0.8} \begin{array}{rcc} \ &\ &\hspace{-1em}\square\square\square \\ \cline{2-3} \kern1em\square& \kern-0.6em {\big)} \kern0.1em & \hspace{-1em}\square\square\square \\ \ &\ &\hspace{-2.5em}\square \\ \cline{2-3} \ &\ &\hspace{-1.75em}\square\square \\ \ &\ &\hspace{-1.75em}\square\square \\ \cline{2-3} \ &\ &\hspace{-0.2em}\square\square \\ \ &\ &\hspace{-0.2em}\square\square \\ \cline{2-3} \ &\ &\hspace{0.6em}\square \\ \end{array}  \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em2& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 357 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em5& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 768 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em6& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 740 \\ \end{array}

[2] 問題
 \setstretch{0.8} \begin{array}{rcc} \ &\ &\hspace{-1em}\square\square\square \\ \cline{2-3} \kern1em\square& \kern-0.6em {\big)} \kern0.1em & \hspace{-1em}\square\square\square \\ \ &\ &\hspace{-2.5em}\square \\ \cline{2-3} \ &\ &\hspace{-1.75em}\square\square \\ \ &\ &\hspace{-1.75em}\square\square \\ \cline{2-3} \ &\ &\hspace{-0.2em}\square\square \\ \ &\ &\hspace{-0.2em}\square\square \\ \cline{2-3} \ &\ &\hspace{0.6em}0 \\ \end{array}  \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em2& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 574 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em4& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 656 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em3& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 735 \\ \end{array}

[3] 問題
 \setstretch{0.8} \begin{array}{rcc} \ &\ &\hspace{-1em}\square\square\square \\ \cline{2-3} \kern1em\square& \kern-0.6em {\big)} \kern0.1em & \hspace{-1em}\square\square\square \\ \ &\ &\hspace{-2.5em}\square \\ \cline{2-3} \ &\ &\hspace{-1.75em}\square\square \\ \ &\ &\hspace{-1.75em}\square\square \\ \cline{2-3} \ &\ &\hspace{-0.2em}\square\square \\ \ &\ &\hspace{0.6em}\square \\ \cline{2-3} \ &\ &\hspace{0.6em}\square \\ \end{array}  \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em4& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 971 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em3& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 760 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em4& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 690 \\ \end{array}

[4][5] 問題
 \setstretch{0.8} \begin{array}{rcc} \ &\ &\hspace{-1em}\square\square\square \\ \cline{2-3} \kern1em\square& \kern-0.6em {\big)} \kern0.1em & \hspace{-1em}\square\square\square \\ \ &\ &\hspace{-2.5em}\square \\ \cline{2-3} \ &\ &\hspace{-1.75em}\square\square \\ \ &\ &\hspace{-1em}\square \\ \cline{2-3} \ &\ &\hspace{-0.2em}\square\square \\ \ &\ &\hspace{-0.2em}\square\square \\ \cline{2-3} \ &\ &\hspace{0.6em}\boxtimes \\ \end{array}  \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em3& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 715 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em4& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 907 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em8& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 923 \\ \end{array}


 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em7& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 826 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em3& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 714 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em6& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 702 \\ \end{array}

[6] 問題
 \setstretch{0.8} \begin{array}{rcc} \ &\ &\hspace{-1em}\square\square\square \\ \cline{2-3} \kern1em\square& \kern-0.6em {\big)} \kern0.1em & \hspace{-1em}\square\square\square \\ \ &\ &\hspace{-2.5em}\square \\ \cline{2-3} \ &\ &\hspace{-1.75em}\square\square \\ \ &\ &\hspace{-1em}\square \\ \cline{2-3} \ &\ &\hspace{-0.2em}\square\square \\ \ &\ &\hspace{0.6em}\square \\ \cline{2-3} \ &\ &\hspace{0.6em}\square \\ \end{array}  \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em3& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 400 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em3& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 701 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em3& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 401 \\ \end{array}

[7][8] 問題
 \setstretch{0.8} \begin{array}{rcc} \ &\ &\hspace{-1em}\square\square\square \\ \cline{2-3} \kern1em\square& \kern-0.6em {\big)} \kern0.1em & \hspace{-1em}\square\square\square \\ \ &\ &\hspace{-2.5em}\square \\ \cline{2-3} \ &\ &\hspace{-1.75em}\square\square \\ \ &\ &\hspace{-1.75em}\square\square \\ \cline{2-3} \ &\ &\hspace{0.6em}\square \\ \ &\ &\hspace{0.6em}\square \\ \cline{2-3} \ &\ &\hspace{0.6em}\boxtimes \\ \end{array}  \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em3& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 758 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em2& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 547 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em6& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 728 \\ \end{array}


 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em3& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 849 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em4& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 648 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em8& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 968 \\ \end{array}

[9][10] 問題
 \setstretch{0.8} \begin{array}{rcc} \ &\ &\hspace{-1em}\square\square\square \\ \cline{2-3} \kern1em\square& \kern-0.6em {\big)} \kern0.1em & \hspace{-1em}\square\square\square \\ \ &\ &\hspace{-2.5em}\square \\ \cline{2-3} \ &\ &\hspace{-0.9em}\square \\ \ &\ &\hspace{-0.9em}\square \\ \cline{2-3} \ &\ &\hspace{-0.2em}\square\square \\ \ &\ &\hspace{-0.2em}\square\square \\ \cline{2-3} \ &\ &\hspace{0.6em}\boxtimes \\ \end{array}  \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em2& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 697 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em3& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 686 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em4& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 857 \\ \end{array}


 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em4& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 852 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em5& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 580 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em7& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 784 \\ \end{array}

[11] 問題
 \setstretch{0.8} \begin{array}{rcc} \ &\ &\hspace{-1em}\square\square\square \\ \cline{2-3} \kern1em\square& \kern-0.6em {\big)} \kern0.1em & \hspace{-1em}\square\square\square \\ \ &\ &\hspace{-2.5em}\square \\ \cline{2-3} \ &\ &\hspace{-0.9em}\square \\ \ &\ &\hspace{-0.9em}\square \\ \cline{2-3} \ &\ &\hspace{-0.2em}\square\square \\ \ &\ &\hspace{0.6em}\square \\ \cline{2-3} \ &\ &\hspace{0.6em}\square \\ \end{array}  \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em3& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 371 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em4& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 490 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em3& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 670 \\ \end{array}

[12][13] 問題
 \setstretch{0.8} \begin{array}{rcc} \ &\ &\hspace{-1em}\square\square\square \\ \cline{2-3} \kern1em\square& \kern-0.6em {\big)} \kern0.1em & \hspace{-1em}\square\square\square \\ \ &\ &\hspace{-2.5em}\square \\ \cline{2-3} \ &\ &\hspace{-0.9em}\square \\ \ &\ &\hspace{-0.9em}\square \\ \cline{2-3} \ &\ &\hspace{0.6em}\square \\ \ &\ &\hspace{0.6em}\square \\ \cline{2-3} \ &\ &\hspace{0.6em}\boxtimes \\ \end{array}  \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em2& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 867 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em3& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 964 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em4& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 487 \\ \end{array}


 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em3& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 693 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em2& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 848 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em3& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 396 \\ \end{array}

[14]一次退化 問題
 \setstretch{0.8} \begin{array}{rcc} \ &\ &\hspace{-1em}\square\square\hspace{0.2em}0 \\ \cline{2-3} \kern1em\square& \kern-0.6em {\big)} \kern0.1em & \hspace{-1em}\square\square\square \\ \ &\ &\hspace{-2.5em}\square \\ \cline{2-3} \ &\ &\hspace{-1.75em}\square\square \\ \ &\ &\hspace{-1.75em}\square\square \\ \cline{2-3} \ &\ &\hspace{0.6em}\square \\ \end{array}  \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em2& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 741 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em4& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 923 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em3& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 812 \\ \end{array}

[15]一次退化 問題
 \setstretch{0.8} \begin{array}{rcc} \ &\ &\hspace{-1em}\square\square\hspace{0.2em}0 \\ \cline{2-3} \kern1em\square& \kern-0.6em {\big)} \kern0.1em & \hspace{-1em}\square\square\hspace{0.2em}0 \\ \ &\ &\hspace{-2.5em}\square \\ \cline{2-3} \ &\ &\hspace{-1.75em}\square\square \\ \ &\ &\hspace{-1.75em}\square\square \\ \cline{2-3} \ &\ &\hspace{0.6em}\hspace{0.2em}0 \\ \end{array}  \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em4& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 720 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em6& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 840 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em7& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 980 \\ \end{array}

[16]一次退化 問題
 \setstretch{0.8} \begin{array}{rcc} \ &\ &\hspace{-1em}\square\square\hspace{0.2em}0 \\ \cline{2-3} \kern1em\square& \kern-0.6em {\big)} \kern0.1em & \hspace{-1em}\square\square\square \\ \ &\ &\hspace{-2.5em}\square \\ \cline{2-3} \ &\ &\hspace{-0.9em}\square \\ \ &\ &\hspace{-0.9em}\square \\ \cline{2-3} \ &\ &\hspace{0.6em}\square \\ \end{array}  \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em2& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 481 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em3& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 692 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em4& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 843 \\ \end{array}

[17]一次退化 問題
 \setstretch{0.8} \begin{array}{rcc} \ &\ &\hspace{-1em}\square\square\hspace{0.2em}0 \\ \cline{2-3} \kern1em\square& \kern-0.6em {\big)} \kern0.1em & \hspace{-1em}\square\square\hspace{0.2em}0 \\ \ &\ &\hspace{-2.5em}\square \\ \cline{2-3} \ &\ &\hspace{-0.9em}\square \\ \ &\ &\hspace{-0.9em}\square \\ \cline{2-3} \ &\ &\hspace{0.6em}\hspace{0.2em}0 \\ \end{array}  \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em3& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 631 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em2& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 820 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em4& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 440 \\ \end{array}

[18][19]一次退化 問題
 \setstretch{0.8} \begin{array}{rcc} \ &\ &\hspace{-1em}\square\hspace{0.2em}0\square \\ \cline{2-3} \kern1em\square& \kern-0.6em {\big)} \kern0.1em & \hspace{-1em}\square\square\square \\ \ &\ &\hspace{-2.5em}\square \\ \cline{2-3} \ &\ &\hspace{-0.2em}\square\square \\ \ &\ &\hspace{-0.2em}\square\square \\ \cline{2-3} \ &\ &\hspace{0.6em}\boxtimes \\ \end{array}  \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em3& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 914 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em4& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 427 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em3& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 625 \\ \end{array}


 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em2& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 816 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em3& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 924 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em4& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 436 \\ \end{array}

[20]一次退化 問題
 \setstretch{0.8} \begin{array}{rcc} \ &\ &\hspace{-1em}\square\hspace{0.2em}0\square \\ \cline{2-3} \kern1em\square& \kern-0.6em {\big)} \kern0.1em & \hspace{-1em}\square\square\square \\ \ &\ &\hspace{-2.5em}\square \\ \cline{2-3} \ &\ &\hspace{-0.2em}\square\square \\ \ &\ &\hspace{0.6em}\square \\ \cline{2-3} \ &\ &\hspace{0.6em}\square \\ \end{array}  \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em3& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 911 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em4& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 810 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em7& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 713 \\ \end{array}

[21][22]一次退化 問題
 \setstretch{0.8} \begin{array}{rcc} \ &\ &\hspace{-1em}\square\hspace{0.2em}0\square \\ \cline{2-3} \kern1em\square& \kern-0.6em {\big)} \kern0.1em & \hspace{-1em}\square\hspace{0.2em}0\square \\ \ &\ &\hspace{-2.5em}\square \\ \cline{2-3} \ &\ &\hspace{0.6em}\square \\ \ &\ &\hspace{0.6em}\square \\ \cline{2-3} \ &\ &\hspace{0.6em}\boxtimes \\ \end{array}  \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em2& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 405 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em4& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 806 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em3& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 905 \\ \end{array}


 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em2& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 802 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em3& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 609 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em7& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 707 \\ \end{array}

[23]二次退化 問題
 \setstretch{0.8} \begin{array}{rcc} \ &\ &\hspace{-1em}\square\hspace{0.2em}0\hspace{0.2em}0 \\ \cline{2-3} \kern1em\square& \kern-0.6em {\big)} \kern0.1em & \hspace{-1em}\square\hspace{0.2em}0\square \\ \ &\ &\hspace{-2.5em}\square \\ \cline{2-3} \ &\ &\hspace{0.6em}\square \\ \end{array}  \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em3& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 602 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em4& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 801 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em9& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 907 \\ \end{array}

[24]二次退化 問題
 \setstretch{0.8} \begin{array}{rcc} \ &\ &\hspace{-1em}\square\hspace{0.2em}0\hspace{0.2em}0 \\ \cline{2-3} \kern1em\square& \kern-0.6em {\big)} \kern0.1em & \hspace{-1em}\square\hspace{0.2em}0\hspace{0.2em}0 \\ \ &\ &\hspace{-2.5em}\square \\ \cline{2-3} \ &\ &\hspace{0.8em}0 \\ \end{array}  \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em4& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 800 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em3& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 900 \\ \end{array}

 \setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em2& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 600 \\ \end{array}


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