Question

Thực hiện phép tính 

a/\(\left(2x^2-3x\right)\left(5x^2-2x+1\right)\)

b/\(\left(2x^4-x^3+3x^2\right):\left(\frac{1}{3}x^2\right)\)

Answer 1

a)\(\left(2x^2-3x\right)\left(5x^2-2x+1\right)\)

\(=2x^2\left(5x^2-2x+1\right)-3x\left(5x^2-2x+1\right)\)

\(=10x^4-4x^3+2x^2-15x^3+6x^2-3x\)

\(=10x^4-19x^3+8x^2-3x\)

Answer 2

a. \(\left(2x^2-3x\right)\left(5x^2-2x+1\right)\)

\(=10x^4-4x^3+2x^2-15x^3+6x^2-3x\)

\(=10x^4-19x^3+8x^2-3x\)

b. \(\left(2x^4-x^3+3x^2\right):\left(\frac{1}{3}x^2\right)\)

\(=\left(2x^4-x^3+3x^2\right).\frac{3}{x^2}\)

\(=0,6x^2-3x+0,9\)