题目内容

约分:
(1)
9a2(x+y)
3a(x+y)

(2)
9-x2
x2+5x+6

(3)
an+2-a2bn
a2n+1-ab2n

(4)
-(x+y)(x-y)2
(y+x)(y2-x2)

(5)
a2+b2-c2+2ab
a2-b2-c2-2bc
(1)原式=3a;

(2)原式=
(3-x)(3+x)
(x+2)(x+3)
=
3-x
x+2


(3)原式=
a2(an-bn)
a(an+bn)(an-bn)
=
a
an+bn


(4)原式=
-(x+y)(x-y)2
(y+x)(y-x)(y+x)
=
x-y
x+y


(5)原式=
(a+b)2-c2
a2-(b+c)2
=
(a+b+c)(a+b-c)
(a-b-c)(a+b+c)
=
a+b-c
a-b-c
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