问题
解答题
计算 (1)(
(2)(-2x)•(2x2y-4xy2) (3)(x+y-3)(x-y+3) (4)(x+1)(x2+1)(x4+1)(x-1) |
答案
(1)原式=4-8×0.125+1+1
=4-1+1+1
=5;
(2)原式=-4x3y+8x2y2;
(3)原式=x2-(y-3)2=x2-y2+6y-9;
(4)原式=(x2+1)(x2+1)(x4+1)
=(x4-1)(x4+1)
=x8-1.