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“硬算” 到 “巧算”：乘法分配律逆用，破解小数简便运算难题
2026-06-20
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Key Point:第1题：3.6×11.1+1.2×66.7一、思路分析观察数字特征：算式由两部分乘法相加组成，没有直接相同的公因数，无法直接使用乘法分配律。但注意到3.6和1.2存在倍数关系：3
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