1) a/x-y-b/y-x+c/x-y 2) x+1/a-b-x+2/b-a-x-1/a-b

1)=ya/xy- x (y^2) /xy- xb/xy- y (x^2) /xy+cy/xy- (y^2) x/xy=(ay-x (y^2) -xb-y (x^2)+cy-x (y^2) /xy=ay-bx+cy-y (x^2) -2 (x (y^2) /xy2)=xab/ab+b/ba-a (b^2) /ab-xba/ba+2a/ba-b (a^2) /ba-bax/ba-b/ab-a (b^2) /ba=(xab+b-a (b^2) -xab+2a-b (a^2) -bax-b-a (b^2) /ab=(-2 (a (b^2) -b (a^2)+2a-bax) /ab