> 数学 >
化简：(a−
a
a+1
)÷
a2−2a
a2−4
×
1
a+2
人气：395 ℃　时间：2020-08-11 22:10:48
解答
(a−
a
a+1
)÷
a2−2a
a2−4
×
1
a+2

=(a−
a
a+1
)×
(a+2)(a−2)
a(a−2)
×
1
a+2

=(a−
a
a+1
)×
1
a

=a×
1
a
−
a
a+1
×
1
a

=1−
1
a+1

=
a
a+1
．
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