把下列各分式通分,化成分母相同的分式.(1) b/a,a/b; (2)1/3x²,5/12xy; (3)2/x+1,1/x-1;

问题描述:

把下列各分式通分,化成分母相同的分式.(1) b/a,a/b; (2)1/3x²,5/12xy; (3)2/x+1,1/x-1;


(1)b²/ab,a²/ab

(2)4y/12x²y,5x/12x²y

(3)2(x-1)/x²-1,x+1/x²-1