a) [x^3y^2/2-×^2y^3/3]•6/×2y2-(radical din 27x^2y-radical din 108xy^2)•1/ radical din 3 xy=3x-2y-3x+6y=4y
b) 0,1(6)=16-1/9=15/9=5/3
[5×^3y^4/3-×^4y^3/5]•5/×^3y^3-(-4×+3y)=25y/3-×+4×-3y=25y-9y/3+3×=16y/3+3×
c) (2×y^2/3-3×^2y/2)•(-6/×y)+(2×^2y^3/5-5×^3y^2/3)•15/×^2y^2=-4y+9×+6y-25×=2y-16×
