【中学受験算数】場合の数 数え上げの工夫【最難関クラス/偏差値up】
Synopsis
1から9までのカードを、３人に全部配る。カードの和が同じになるようにだから、一人当たり４５÷３＝15，ここまでは大丈夫だ ...
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