Question

对 a的平方分之1,a的平方+3a-10分之a,a的平方+7a+10分之1 通分

Answer 1

1/a²

a/(a²+3a-10)=a/(a+5)(a-2)

1/(a²+7a+10)=1/(a+2)(a+5)

最简公分母a²(a+2)(a-2)(a+5)

所以

1/a²=(a+2)(a-2)(a+5)/a²(a+2)(a-2)(a+5)

a/(a²+3a-10)=a³(a+2)/a²(a+2)(a-2)(a+5)

1/(a²+7a+10)=a²(a-2)/a²(a+2)(a-2)(a+5)