통분 1.a/(a^2-9),a-1/a^2+6a+9 2.x/2(x+1),1/x^2-x 3.1/x^2-4,x/4-2x

통분 1.a/(a^2-9),a-1/a^2+6a+9 2.x/2(x+1),1/x^2-x 3.1/x^2-4,x/4-2x

1,a/(a^2-9)와(a-1)/a^2+6a+9,a/(a^2-9)=a/(a+3)(a-3)(a-3),(a-1)(/a^2+6a+9)=(a-1)/(a-2-9)=a-1)/(a+3)(a+3)(a+3)(a+3),공분모(a+3)(a+3)(a+3)(a+3)(a+3)(a+3)(a-3),즉 a/(a-2-9)=a(a-3)=a(a-3)=a(a+3)(a+3)/(a+3)/(a+3)/(+3)(a-3),(a-1)(/a^2+6a+9)...