(x^2-2x-3)/(x^2+2x+1) (x^2+x-2)/(x+2)约分

题目

(x^2-2x-3)/(x^2+2x+1) (x^2+x-2)/(x+2)约分

答案

(x^2-2x-3)/(x^2+2x+1)
=(x-3)(x+1)/(x+1)²
=(x-3)/(x+1);
(x^2+x-2)/(x+2)
=(x+2)(x-1)/(x+2)
=x-1;
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