把下列各分式约分化简(1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12).

发布时间:2020-08-06 17:24:14

把下列各分式约分化简
(1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12).

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解:(1)=;

(2)=-;

(3)=-;

(4)=;

(5)=;

(6)=-;

(7)
=
=;

(8)
=
=;
(9)=-;

(10)
=
=3x-3;

(11)
=
=;

(12)
=
=
=.
解析分析:对于分子分母为单项式的分式,直接约分;对于分子分母是多项式的分式,先因式分解,再约分.

点评:本题考查了约分,熟悉因式分解是解题的关键.
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