问题
解答题
计算: (1)(-1)3+(2012-
(2)
(3)
(4)
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答案
(1)原式=-1+1-4
=-4;
(2)原式=a2+2ab+b2-(a2-2ab+b2) ab
=4ab ab
=4;
(3)原式=
-3(x+4) (x+4)(x-4) 24 (x+4)(x-4)
=3x-12 (x+4)(x-4)
=3(x-4) (x+4)(x-4)
=
;3 x+4
(4)原式=
•(x-1)2 (x+1)(x-1) x(x+1) x-1
=x.