分式通分,要过程!!!!!!!!!!!!!!!!!!!!!!!!!!
(1)1/2x+3,3/3-2x.2x+5/4x^2-9
(2)a/a-b,b/a^2-b^2,c/a+b
(1)1/宏世(2x+3)=(2x-3)/(2x-3)(2x+3)
3/(3-2x)=-(2x+3)/(2x-3)(2x+3)
(2x+5)/搜拍(4x^2-9)=(2x+5)/(2x-3)(2x+3)
(2)a/世绝羡(a-b)=a(a+b)/(a+b)(a-b)
b/(a^2-b^2)=b/(a+b)(a-b)
c/(a+b)=c(a-b)/(a+b)(a-b)