问题
解答题
化简
(1)(a+b-1)(a-b+1)
(2)(2x2)3-6x3(x3+2x2+x).
答案
(1)原式=a2-(b-1)2=a2-b2+2b-1;
(2)原式=8x6-6x6-12x5-6x4=2x6-12x5-6x4.
化简
(1)(a+b-1)(a-b+1)
(2)(2x2)3-6x3(x3+2x2+x).
(1)原式=a2-(b-1)2=a2-b2+2b-1;
(2)原式=8x6-6x6-12x5-6x4=2x6-12x5-6x4.