3a^2-2a-5/3a^2-2a-1*a^2-1/a+1÷(a+1)

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3a^2-2a-5/3a^2-2a-1*a^2-1/a+1÷(a+1)
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3a^2-2a-5/3a^2-2a-1*a^2-1/a+1÷(a+1)
3a^2-2a-5/3a^2-2a-1*a^2-1/a+1÷(a+1)

3a^2-2a-5/3a^2-2a-1*a^2-1/a+1÷(a+1)
(3a^2-2a-5)/(3a^2-2a-1)*(a^2-1)/(a+1)÷(a+1)
=(a+1)(3a-5)/(a-1)(3a+1) * (a+1)(a-1)/(a+1) * 1/(a+1)
=(a+1)(3a-5)(a+1)(a-1)/(a-1)(3a+1)(a+1)(a+1)
=(3a-5)/(3a+1)

你看一下分子分母是不是这样,有不懂再追问