1) x^2 4x/x^2+7x : 24-6x/49-x^2
2) y^3-16y/2y+18 : 4-y/y^2+9y
3) (a+b)^2-2ab/4a^2 : a^2+b^2/ab
4) 5c^3-5/c+2 : (c+1)^2-c/13c+26