计算:(1)x+2x2-6x+9÷13-x×x-3x+2(2)(x2-1x2-2x+1-x+1)÷xx-1.-数学

题目简介

计算:(1)x+2x2-6x+9÷13-x×x-3x+2(2)(x2-1x2-2x+1-x+1)÷xx-1.-数学

题目详情

计算:(1)
x+2
x2-6x+9
÷
1
3-x
×
x-3
x+2
      (2)(
x2-1
x2-2x+1
-x+1)÷
x
x-1
题型:解答题难度:中档来源:不详

答案

(1)class="stub"x+2
x2-6x+9
÷class="stub"1
3-x
×class="stub"x-3
x+2

=class="stub"x+2
(x-3)2
×(3-x)×class="stub"x-3
x+2

=-1;

(2)(
x2-1
x2-2x+1
-x+1)÷class="stub"x
x-1

=[
(x-1)(x+1)
(x-1)2
-
(x-1)2
x-1
class="stub"x-1
x

=
-x2+3x
x-1
×class="stub"x-1
x

=-x+3.

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