化简2x-【2(x+4)-3(x+2y)】-2y

问题描述:

化简2x-【2(x+4)-3(x+2y)】-2y

=2x-2x-8+3x+6y-2y
=3x+4y-8

2x-【2(x+4)-3(x+2y)】-2y
=2x-(2x+8-3x-6y)-2y
=2x-(-x-6y+8)-2y
=2x+x+6y-8-2y
=3x+4y-8