Question

问两个问题.通分：(x+4)/(x^2-8x+15)、(x+5)/(x^2+x-12)和(x-3)/(x^2-x-20)

Answer 1

1.（x+4）/(x-3)(x-5) ;(x+5)/(x+4)(x-3); (x-3)/(x-5)(x+4);通分结果：

（x+4)^2/(x-3)(x+4)(x-5) ; ;(x^2-25)/(x+4)(x-3)(x-5);(x-3)^2/(x-3)(x+4)(x-5)

2.(3a+4b)^2/(3a+4b)=3a+4