Question

Rút gọn biểu thức :

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

Answer 1

Ta có: \(2x\left(3x^3-x\right)-4x^2\left(x-x^2+1\right)+\left(x-3x^2\right)x\)

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

=\(10x^4-7x^3-5x^2\)

Answer 2

2x.3x³-2x.x-4x².x-4x².(-x²)-4x².1+x.x-3x².x

6x⁴-2x²-4x³+4x⁴-4x²+x²-3x³

(6x⁴+4x⁴)+(-4x³-3x³)+(-2x²-4x²+x²)

10x⁴-7x³-5x²

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