3.8*5.4+7.2*6.2+1.8*3.8简便计算

题目

3.8*5.4+7.2*6.2+1.8*3.8简便计算

答案

=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