(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
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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
(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!