1/у^3
-2x^2y
(2ab^2)^7
y^4/(y*y^2*3)=y/35*x^2*y-8*x^2*y + x^2*y=-2*x^2*y(2*a*b^2)^4*(2*a^b)^3=128*a^(3*b+4)*b^8
