Question

35×0.3+3.5×7 简便计算

Answer 1

3.5变成35 7变成0.7

Answer 2

3.5*10

追问

过程呢

追答

3.5*3+3.5*7

Answer 3

=3.5*10*0.3+3.5*7＝3.5*（3+7）＝35