计算:(3x-4y)-[-(2y+x)+(x-3y)]-6x

问题描述:

计算:(3x-4y)-[-(2y+x)+(x-3y)]-6x

(3x-4y)-[-(2y+x)+(x-3y)]-6x
=3x-4y+(2y+x)-(x-3y)-6x
=3x-4y+2y+x-x+3y-6x
=(3x+x-x-6x)-(4y-2y-3y)
=-3x+y

原式=3x-4y+(2y+x)-(x-3y)-6x
=-3x-4y+(2y+x)-(x-3y)
=-3x-4y+2y+x-x+3y
=-3x+y