Question

viết biểu thức sau dưới dạng tổng

(2x^3 + 1)

Answer 1

(2x+1)³ 

= (2x)³+3.2x² + 3.2x + 1³

= 8x³ + 6x² + 6x + 1            

Answer 2

exin lỗi (2x+1)^3

Answer 3

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

\(=\left(2x+1\right)\left(2x+1\right)\left(2x+1\right)\)

\(=\left(4x^2+2x+2x+1\right)\left(2x+1\right)\)

\(=\left(4x^2+4x+1\right)\left(2x+1\right)\)

\(=8x^3+8x^2+2x+4x^2+4x+1\)

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

Answer 4

    (2x+1)^3

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

=8x^3 + 6x^2 + 6x + 1