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趣味数学之利用乘法分配律来进行巧算，要有较强的观察能力
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 巧算：借助乘法分配律来进行巧算
小学趣味数学：奥数精炼，让孩子打开思维，爱上数学学习324/373
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