cBài 1:Thực hiện phép tính
\(a,2x^2y\left(x^2+xy-3y^2\right)\)

\(=2x^4y+2x^3y^2-6x^2y^3\)

\(b,x^2\left(2x^3-4x+3\right)\)

\(=2x^5-4x^3+3x^2\)

\(c,\left(3x+4x^2-2\right)\left(-x^2+1\right)\)

\(x\left(x+2\right)-\left(x-2\right)^2=8\)

\(x^2+2x-x^2+4x-4=8\)

\(6x-4=8\)

\(x=2\)

\(\dfrac{x}{0}\)