1.9减1.9乘(1.9减1.9)的简便计算(要过程)

问题描述:

1.9减1.9乘(1.9减1.9)的简便计算(要过程)

1.9减1.9乘(1.9减1.9)
=1.9-1.9x0
=1.9-0
=1.9