4.2×1.2-5.2×0.7的简便运算
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4.2×1.2-5.2×0.7的简便运算
4.2×1.2-5.2×0.7的简便运算
4.2×1.2-5.2×0.7的简便运算
4.2×1.2-5.2×0.7 =0.7×6×1.2-5.2×0.7 =0.7×7.2-5.2×0.7 =0.7×(7.2-5.2) =0.7×2 =1.4
4.2×1.2-5.2×0.7的简便运算
4.2×1.2-5.2×0.7的简便运算
4.2×1.2-5.2×0.7的简便运算
4.2×1.2-5.2×0.7 =0.7×6×1.2-5.2×0.7 =0.7×7.2-5.2×0.7 =0.7×(7.2-5.2) =0.7×2 =1.4