Bài 2:
b: \(=x^3+3x^2+3x+1-4x^2+1+x^2\)
\(=x^3+3x+2\)
c: \(=x^2-9+\left(x-1\right)\left(2x-4\right)\)
\(=x^2-9+2x^2-4x-2x+4\)
\(=3x^2-6x-5\)
d: \(=x^3-3x^2+x-3-\left(x^3-27\right)\)
\(=x^3-3x^2+x-3-x^3+27=-3x^2+x+24\)
a: \(=x^3+3x^2y+3xy^2+y^3+x^2-2xy+y^2\)
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