问题描述:
(1)a3•a3+(-2a3)2+(-a2)3
(2)(x+2)2-(x-1)(x+1)
(3)(x+y+z)(x+y-z)
(4)3(-a+1)(-a-1)-2(a+1)2
(5)(-x2)3-3x2(x4+2x-2)
(6)(2a+b)2-(-2a-b)2.
(2)(x+2)2-(x-1)(x+1)
(3)(x+y+z)(x+y-z)
(4)3(-a+1)(-a-1)-2(a+1)2
(5)(-x2)3-3x2(x4+2x-2)
(6)(2a+b)2-(-2a-b)2.
问题解答:
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