如果X-(5+2Y)=25,那么3x-6y=?
问题描述：
如果X-(5+2Y)=25,那么3x-6y=?
答
X-(5+2Y)=25
x-2y=30
3x-6y
=3(x-2y)
=3×30
=90
答
X-(5+2Y)=25
x-5-2y=25
x-2y=30
3x-6y=3(x-2y)=90