A.x/x+1 B.x/x-1 C.1/x+1 D.1/x-1

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问题 A.x/x+1B.x/x-1C.1/x+1D.1/x-1

选项 A.x/x+1
B.x/x-1
C.1/x+1
D.1/x-1

答案 B

解析
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