3.8*5.4+7.2*6.2+1.8*3.8简便计算
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3.8*5.4+7.2*6.2+1.8*3.8简便计算
3.8*5.4+7.2*6.2+1.8*3.8简便计算
3.8*5.4+7.2*6.2+1.8*3.8简便计算
=3.8×5.4+1.8×3.8+7.2×6.2
=3.8×(5.4+1.8)+7.2×6.2
=3.8×7.2+7.2×6.2
=(3.8+6.2)×7.2
=10×7.2
=72