Question

8.9×5.7 5.7×2.1-5.7简便算法怎么做

Answer 1

8.9×5.7+5.7×2.1-5.7
解：简便计算
=8.9×5.7+5.7×2.1-5.7x1
=5.7x(8.9+2.1-1) 乘法分配律
=5.7x10
=57
祝学习进步。