主题: 这个数学题怎么做?
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旧 Jul 20th, 2004, 19:27     #1
xiaolichina
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Red face 这个数学题怎么做?
4.1 班有46人，会钢琴的有30人，小提琴的有28人，这个班
会钢琴的又会小提琴的有多少人？
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