7x+4x=36怎样验算
问题描述:
7x+4x=36怎样验算
答
方程左边=7*12-4*12
=84-48
=36
=方程右边
7x+4x=36怎样验算
方程左边=7*12-4*12
=84-48
=36
=方程右边