Question

0.32×399简便运算？

Answer 1

0.32×399
=0.32×(400−1)
=0.32×400−0.32×1
=128−0.32
=127.68

Answer 2

0.32×399的简便运算过程如下：
0.32×399
=0.32×（400-1）
=0.32×400-0.32×1
=128-0.32
=127.68