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小学数学思维：现在三层书的数量相等，原来每层有多少本书呢
精讲小学数学思维题：3层书架有270本书。从一层拿20本书放在二层，从三层拿17本书放在二层。这时，三层的书数量相等。原来每层有多少本书？@忆梦月华
小学数学思维题165/239
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