试题与答案

化简:(a-aa+1)÷a2-2aa2-4×1a+2

题型:解答题

题目:

化简:(a-
a
a+1
a2-2a
a2-4
×
1
a+2

答案:

(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

=

1
a
-
a
a+1
×
1
a

=1-

1
a+1

=

a
a+1

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