题目内容

化简:
(1)
3a2bc3
15a3bc
=______;
(2)
x2-9
x-3
=______;
(3)
x2+2x+1
x2-1
=______;
(4)
4b2-a2
4b2-4ab+a2
=______.
(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
c2
5a
;x+3;
x+1
x-1
2b+a
2b-a
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