计算:2x+1-x-2x2-1÷x2-2xx2-2x+1.-数学

题目简介

计算:2x+1-x-2x2-1÷x2-2xx2-2x+1.-数学

题目详情

计算:
2
x+1
-
x-2
x2-1
÷
x2-2x
x2-2x+1
题型:解答题难度:中档来源:不详

答案

原式=class="stub"2
x+1
-class="stub"x-2
(x+1)(x-1)
×
(x-1)2
x(x-2)

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

=
2x-(x-1)
x(x+1)

=class="stub"1
x

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