中３数学 二次方程式の利用③ 直方体の箱の容積 0841
Synopsis
横が縦より１０ｃｍ長い長方形の紙の４隅から一辺が３㎝の正方形を切り取り、直方体の容器を作り、その容積が３００㎤になる ...
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