9 +4x =40 解出来.
问题描述:
9 +4x =40 解出来
.
答
9 +4x =40
4x=40-9
4x=31
x=31/4
9 +4x =40 解出来
.
9 +4x =40
4x=40-9
4x=31
x=31/4