(1)(a^2-1)/(a^2-a-2)约分 (2)x(x^2+x)/x^2(x^2-1)约分
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![(1)(a^2-1)/(a^2-a-2)约分 (2)x(x^2+x)/x^2(x^2-1)约分](/uploads/image/z/12891904-16-4.jpg?t=%EF%BC%881%EF%BC%89%28a%5E2-1%29%2F%28a%5E2-a-2%29%E7%BA%A6%E5%88%86+%EF%BC%882%EF%BC%89x%28x%5E2%2Bx%29%2Fx%5E2%28x%5E2-1%29%E7%BA%A6%E5%88%86)
(1)(a^2-1)/(a^2-a-2)约分 (2)x(x^2+x)/x^2(x^2-1)约分
(1)(a^2-1)/(a^2-a-2)约分 (2)x(x^2+x)/x^2(x^2-1)约分
(1)(a^2-1)/(a^2-a-2)约分 (2)x(x^2+x)/x^2(x^2-1)约分
(1)(a^2-1)/(a^2-a-2)约分
=(a+1)(a-1)/(a-2)(a+1)
=(a-1)/(a-2)
(2)x(x^2+x)/x^2(x^2-1)约分
=x²(x+1)/x²(x+1)(x-1)
=1/(x-1)
分解因式以后约分
1) 原式 =(a+1)(a-1)/(a-2)(a+1) =a-1 /a-2
2)原式 =x²(x+1)/x²(x+1)(x-1) =1/x-1
(1)(a-1)/(a-2) (2)1/(x-1)
(1)(a^2-1)/(a^2-a-2)约分
=(a+1)(a-1)/(a-2)(a+1)
=(a-1)/(a-2)
(2)x(x^2+x)/x^2(x^2-1)约分
=x²(x+1)/x²(x+1)(x-1)
=1/(x-1)很容易噢!