(2x-3y)-(3y-2x)+(6y-4x)
问题描述:
(2x-3y)-(3y-2x)+(6y-4x)
答
(2x-3y)-(3y-2x)+(6y-4x)
=2x-3y-3y+2x+6y-4x
=(2x+2x-4x)+(-3y-3y+6y)
=0+0
=0