Question

Khai triển :
(x+1)³ , (x-2)³ , (x+3)³ , (2x-1)³ , (3x-2y)³

Answer 1

mấy cả +2³ thành -2³ nữa nhé

Answer 2

\(\left(3x-2y\right)^3=\left(3x\right)^3-3.\left(3x\right)^2.2y+3.3x.\left(2y\right)^2-\left(2y\right)^3\)

\(=27x^3-54x^2y+36xy^2-8y^3\)

Answer 3

\(\left(x+1\right)^3=x^3+3.x^2.1+3.x.1^2+1^3\)

\(=x^3+3x^2+3x+1\)

Answer 4

\(\left(x-2\right)^3=x^3-3.x^2.2+3.x.2^2+2^3\)

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

Answer 5

\(\left(x+3\right)^3=x^3+3.x^2.3+3.x.3^2+3^3\)

\(=x^3+9x^2+27x+27\)

Answer 6

\(\left(2x-1\right)^3=\left(2x\right)^3-3.\left(2x\right)^2.1+3.2x.1^2-1^3\)

\(=8x^3-12x^2+6x-1\)

Answer 7

mk gõ nhầm dấu ở (x-2)³

^{bn sửa +8 thành -8 nhé}