#)Giải :
a) \(M=\left(3x^3+3x^2y-3xy^2+xy\right)-\left(2x^3-3x^2y-3xy^2+xy+1\right)\)
\(M=\left(3x^3-2x^3\right)+\left(3x^2y-3x^2y\right)+\left(-3xy^2+3xy^2\right)-\left(xy-xy\right)+1\)
\(M=x^3+1\)
b) \(M=-28\Leftrightarrow1+x^3=-28\)
\(\Rightarrow x^3=-27=\left(-3\right)^3=-3\)
Vậy ..................................................