问题
解答题
化简：(a-
|
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
=a×
-1 a
×a a+1 1 a
=1-1 a+1
=
．a a+1
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化简：(a-
|
(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