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趣味数学盈亏问题⑤：李妈妈带了多少钱买2种洗衣粉呢？逆向思维
本节的内容主要讲述的是小学趣味数学（多为思维训练的题目），可以尝试让孩子做一做，很有挑战意义；本节涉及的是盈亏问题⑤：准备多少钱来买洗衣粉呢
小学趣味数学：奥数精炼，让孩子打开思维，爱上数学学习306/373
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