化简:a/a-1÷(a-1/a)等于有选项A.1/a+1B.1C.1/a-1D.-1

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化简:a/a-1÷(a-1/a)等于有选项A.1/a+1B.1C.1/a-1D.-1
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化简:a/a-1÷(a-1/a)等于有选项A.1/a+1B.1C.1/a-1D.-1
化简:a/a-1÷(a-1/a)等于
有选项
A.1/a+1
B.1
C.1/a-1
D.-1

化简:a/a-1÷(a-1/a)等于有选项A.1/a+1B.1C.1/a-1D.-1
你的题目是
[(a-1)/a]÷(a-1/a)
=(a-1)/a÷[(a² -1)/a]
=(a-1)/aXa/(a² -1)
=(a-1)/(a²-1)²
=1/(a+1)
选择A

以上都不是,应该是 a^2/(a-1)^2