Bài 2:
a) \(=12x^3+10x^2+6x\)
b) \(=2x^4+6x^3-8x^2-10x^3-30x^2+40x=2x^4-4x^3-38x^2+40x\)
c) \(=x^3+8xy+2x^2+16y\)
d) \(=x^3-5x^2y+xy^2-x^2y+5xy^2-y^3=x^3-6x^2y+6xy^2-y^3\)
Bài 3:
a) \(=5x\left(x-2\right)\)
b) \(=2xy\left(x+2-3y\right)\)
c) \(=\left(x-4\right)^2\)
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