Question

6.87+68.7×9.9用简便运算怎么做怎么做？

Answer 1

简便计算过程如下
6.87+68.7×9.9
=68.7×0.1+68.7×9.9
=68.7×（0.1+9.9）
=68.7×10
=687
望采纳

Answer 2

6.87+6.87•99
=6.87•（1+99）
=6.87•100
=687