计算:(1)x+1x•(2xx+1)2-(1x-1-1x+1);(2)5x+3yx2-y2-2xx2-y2.-数学

题目简介

计算:(1)x+1x•(2xx+1)2-(1x-1-1x+1);(2)5x+3yx2-y2-2xx2-y2.-数学

题目详情

计算:
(1)
x+1
x
•(
2x
x+1
)2-(
1
x-1
-
1
x+1
)

(2)
5x+3y
x2-y2
-
2x
x2-y2
题型:解答题难度:中档来源:不详

答案

(1)原式=class="stub"x+1
x
4x2
(x+1)2
-class="stub"x+1-x+1
(x+1)(x-1)

=class="stub"4x
x+1
-class="stub"2
(x+1)(x-1)

=
4x2-4x-2
(x+1)(x-1)


(2)原式=class="stub"5x+3y-2x
x2-y2

=
3(x+y)
(x+y)(x-y)

=class="stub"3
x-y

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