a) (34x3):(−12x2)=−32x;
b) (5xn):(4x2)(n∈N,n≥2)=54xn−2;
c) (x3−3x2+6x):(−13x)=−3x2+9x−18;
d) (x+13x2+72x3):(5x)=710x+115x+15.
