问题
解答题
1-
|
答案
原式=1-
×a-1 a a(a+2) (a+1)(a-1)
=1-
=a+2 a+1 a+1-(a+2) a+1
=
=-a+1-a-2 a+1
．1 a+1
故答案为-
．1 a+1
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1-
|
原式=1-
×a-1 a a(a+2) (a+1)(a-1)
=1-
=a+2 a+1 a+1-(a+2) a+1
=
=-a+1-a-2 a+1
．1 a+1
故答案为-
．1 a+1