计算分式a²/a-1+a+1得( ) A 2a²-1/a-1 B1/1-a C1/a-1 D-2a²+1/a-1

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计算分式a²/a-1+a+1得()A2a²-1/a-1B1/1-aC1/a-1D-2a²+1/a-1计算分式a²/a-1+a+1得()A2a²-1/a

计算分式a²/a-1+a+1得( ) A 2a²-1/a-1 B1/1-a C1/a-1 D-2a²+1/a-1
计算分式a²/a-1+a+1得( ) A 2a²-1/a-1 B1/1-a C1/a-1 D-2a²+1/a-1

计算分式a²/a-1+a+1得( ) A 2a²-1/a-1 B1/1-a C1/a-1 D-2a²+1/a-1
a²/(a-1)+(a+1)
=[a²+(a-1)(a+1)]/(a-1)
=(a²+a²-1)/(a-1)
=(2a²-1)/(a-1)
选A

- -。。。一般不会就选C