合并同类项. (1)5(2x-7y)-3(4x-l0y) (2)2x-[2(x+3y)-3(x-2y)].
问题描述:
合并同类项.
(1)5(2x-7y)-3(4x-l0y)
(2)2x-[2(x+3y)-3(x-2y)].
答
(1)原式=10x-35y-12x+30y=-2x-5y;
(2)原式=2x-2x-6y+3x-6y=3x-12y.