分式加减计算a²+3/a²-1 -a+1/a-1 +1
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分式加减计算a²+3/a²-1-a+1/a-1+1分式加减计算a²+3/a²-1-a+1/a-1+1分式加减计算a²+3/a²-1-a+1/
分式加减计算a²+3/a²-1 -a+1/a-1 +1
分式加减计算a²+3/a²-1 -a+1/a-1 +1
分式加减计算a²+3/a²-1 -a+1/a-1 +1
原式=(a²+3)/(a+1)(a-1)-(a+1)²/(a+1)(a-1)+(a+1)(a-1)/(a+1)(a-1)
=(a²+3-a²-2a-1+a²-1)/(a+1)(a-1)
=(a²-2a+1)/(a+1)(a-1)
=(a-1)²/(a+1)(a-1)
=(a-1)/(a+1)