Question

g) rút gọn:3x (12x - 4y )- 2x (4x -3y) +8x^3

Answer 1

3\(x\)(12\(x\) - 4y) - 2\(x\)(4x - 3y) + 8\(x\)\(^3\)

= 36\(x\)\(^2\) - 12\(xy\) - 8\(x^2\) + 6\(xy\) + 8\(x^3\)

= (36\(x^2\) - 8\(x^2\)) - (12\(xy-6xy\)) + 8\(x^3\)

= 24\(x^2\) - 6\(xy\) + 8\(x\)\(^3\)

= 8\(x^3\) -6\(x\)y + 24\(x^2\)

Answer 2

36x2 -12xy -8x2+6xy +8x3
24x2-6xy+8x3

Answer 3

3x(12x - 4y) - 2x(4x - 3y) + 8x³

= 36x² - 12xy + 8x² + 6xy + 8x³

= 8x³ + 44x² - 6xy

Answer 4

Ta có: \(3x\left(12x-4y\right)-2x\left(4x-3y\right)+8x^3\)

\(=36x^2-12xy-8x^2+6xy+8x^3\)

\(=8x^3+28x^2-6xy\)