(1) (a²-a)÷a/a-1 (2) x²-1/y ÷ x+1/y² (3) x

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  • 注:第一题a^2代表a的2次方,2、3题同理.(1)答案0.步骤:原式=a(a-1)/a^2-1=(a-1)/a-1=0;(2)分式前是否有括号?如有答案:y(x-1)步骤:原式=(x+1)(x-1)/y*y^2/(x+1)=y(x-1);(3)同样 个人认为分式前后都有括号,答案:【x/(x-3)】^2.步骤:原式=【x(x+2)/(x-3)^2】*【x(x-3)/(x+2)(x-2)】=x^2/(x-3)^2=【x/(x-3)】^2.希望对你有用