a) (1phần2x – 3) mũ 3 =? b) (2x+1)mũ3 =? c) (2x + 1) mũ 3 =? d) (3x-1phần2)mũ 2 =?

Question

a) (1phần2x – 3) mũ 3
=?
b) (2x+1)mũ3
=?
c) (2x + 1) mũ 3
=?
d) (3x-1phần2)mũ 2
=?

in progress 0
Athena 1 năm 2021-07-20T14:14:59+00:00 2 Answers 9 views 0

Answers ( )

    0
    2021-07-20T14:16:37+00:00

    a.

    `(1/2x-3)^3`

    `=(1/2x)^3+3*(1/2x)^2*3+3*1/2x*3^2+3^3`

    `=1/8x^3+9/4x^2+27/2x+27`

    b.

    `(2x+1)^3`

    `=(2x)^3+3*(2x)^2*1+3*2x*1^2+1^3`

    `=8x^3+12x^2+6x+1`

    c. 

    `(2x+1)^3`

    `=(2x)^3+3*(2x)^2*1+3*2x*1^2+1^3`

    `=8x^3+12x^2+6x+1`

    d. 

    `(3x-1/2)^2`

    `=(3x)^2-2*3x*1/2+(1/2)^2`

    `=9x^2-3x+1/4`

    0
    2021-07-20T14:16:58+00:00

    Đáp án:

     

    Giải thích các bước giải:

    $\left (\dfrac{1}{2}x-3 \right )^3$

    $=\dfrac{1}{8}x^3-\dfrac{9}{4}x^2+\dfrac{27}{2}x -27$

    $(2x+1)^3$

    $=8x^3+12x^2+6x+1$

    $(2x+1)^3$

    $=8x^3+12x^2+6x+1$

    $\left (3x-\dfrac{1}{2} \right )^2$

    $=9x^2-3x+\dfrac{1}{4}$

Leave an answer

Browse

35:5x4+1-9:3 = ? ( )