问题
解答题
计算
(1)3(x-2y)+2(3x+y)
(2)-2y3+(2x3-xyz)-2(x3-y3+xyz)
答案
(1)原式=3x-6y+6x+2y=9x-4y;
(2)原式=-2y3+2x3-xyz-2x3+2y3-2xyz=-3xyz.
计算
(1)3(x-2y)+2(3x+y)
(2)-2y3+(2x3-xyz)-2(x3-y3+xyz)
(1)原式=3x-6y+6x+2y=9x-4y;
(2)原式=-2y3+2x3-xyz-2x3+2y3-2xyz=-3xyz.