题目内容
约分:
(1)
;
(2)
;
(3)
;
(4)
;
(5)
.
(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)原式=
=
;
(4)原式=
=
;
(5)原式=
=
=
.
(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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