化简a²/a-1 +a+1化简a²/a-1 +a+1/为分数线
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化简a²/a-1 +a+1化简a²/a-1 +a+1/为分数线
化简a²/a-1 +a+1
化简a²/a-1 +a+1
/为分数线
化简a²/a-1 +a+1化简a²/a-1 +a+1/为分数线
原式=[a²-(a+1)(a-1)]/(a-1)
=[a²-(a²-1)]/(a-1)
=(a²-a²+1)/(a-1)
=1/(a-1)