问题
解答题
化简: (1)
(2)
(3)
(4)
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答案
(1)
=3a2bc3 15a3bc
;c2 5a
(2)
=x2-9 x-3
=x+3;(x+3)(x-3) x-3
(3)
=x2+2x+1 x2-1
=(x+1)2 (x+1)(x-1)
;x+1 x-1
(4)
=4b2-a2 4b2-4ab+a2
=(2b+a)(2b-a) (2b-a)2
.2b+a 2b-a
故答案为
;x+3;c2 5a
;x+1 x-1
.2b+a 2b-a