化简:(1)3a2bc315a3bc=______;(2)x2-9x-3=______;(3)x2+2x+1x2-1=______;(4)4b2-a24b2-4ab+a2=______.-数学

题目简介

化简:(1)3a2bc315a3bc=______;(2)x2-9x-3=______;(3)x2+2x+1x2-1=______;(4)4b2-a24b2-4ab+a2=______.-数学

题目详情

化简:
(1)
3a2bc3
15a3bc
=______;
(2)
x2-9
x-3
=______;
(3)
x2+2x+1
x2-1
=______;
(4)
4b2-a2
4b2-4ab+a2
=______.
题型:解答题难度:中档来源:不详

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)
=class="stub"x+1
x-1


(4)
4b2-a2
4b2-4ab+a2
=
(2b+a)(2b-a)
(2b-a)2
=class="stub"2b+a
2b-a

故答案为
c2
5a
;x+3;class="stub"x+1
x-1
class="stub"2b+a
2b-a

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