问题
解答题
计算题
(1)2(x-1)-3(x2-x+2)
(2)3(x+1)(x-1)-(2x-1)2.
答案
(1)原式=2x-2-3x2+3x-6=-3x2+5x-8;
(2)原式=3x2-3-4x2+4x-1=-x2+4x-4
计算题
(1)2(x-1)-3(x2-x+2)
(2)3(x+1)(x-1)-(2x-1)2.
(1)原式=2x-2-3x2+3x-6=-3x2+5x-8;
(2)原式=3x2-3-4x2+4x-1=-x2+4x-4