c: \(\dfrac{1}{8}x^3-\dfrac{9}{4}x^2y+\dfrac{27}{2}xy^2-27y^3=\left(\dfrac{1}{2}x-3y\right)^3\)

b: \(-x^3+12x^2-48x+64=\left(-x+4\right)^3\)

TL:

2017/1000 <x<3405/1000

2.017 <x< 3,405

Vậy x sẽ bằng 3,400 hay 3,4

TL:

2017/1000 < x < 3405/1000

2.017 < x < 3,405

Vậy x sẽ bằng: 3,400 hay 3,4

HT

T I C K cho mik ik bạn

500 nhé chị phương

500 nha

= 500 nha bn, k mk nha bn ~~~~~~~~~~~~~~~~~~~~~THANK~~~~~~~~~~~~~~~~~~~~~~~

D.

Câu đúng: D

Câu sai: B

Tick nha!! Tks

HT

D.

\(a,=8\left(x^3-125\right)=8\left(x-5\right)\left(x^2+5x+25\right)\\ b,=\left(0,1+4x\right)\left(0,01-0,4x+16x^2\right)\\ c,=\left(x+\dfrac{1}{5}y\right)\left(x^2-\dfrac{1}{5}xy+\dfrac{1}{25}y^2\right)\\ d,=\left(3x-\dfrac{1}{2}y\right)\left(9x^2+\dfrac{3}{2}xy+\dfrac{1}{4}y^2\right)\\ e,=\left(x-1+3\right)\left[\left(x-1\right)^2-3\left(x-1\right)+9\right]\\ =\left(x+2\right)\left(x^2-2x+1-3x+3+9\right)\\ =\left(x+2\right)\left(x^2-5x+13\right)\\ f,=\left(\dfrac{x^2}{2}-y^2\right)\left(\dfrac{x^4}{4}+\dfrac{x^2y^2}{2}+y^4\right)\)

8x³-50x=0
x(8x²-50)=0
TH1: x=0           TH2: 8x²-50=0
                                   8x²     = 50
                                     x²     = \(\dfrac{25}{4}\)
                                     x       = + - \(\dfrac{5}{2}\)
vậy x\(\in\){0,+-\(\dfrac{5}{2}\)}

a) ( -2x - 28 )⁵ = -32 = ( -2 )⁵

-2x - 28 = -2

-2x = ( -2 ) + 28 = 26

x = 26 : ( -2 ) = -13

b) ( 7x - 11 )³ = 1000 = 10³

7x - 11 = 10

7x = 10 + 11 = 21

x = 21 : 7 = 3

c) ( 3x - 15 )² - 6 = 75

( 3x - 15 )² = 75 + 6 = 81 = 9²

3x - 15 = 9

3x = 9 + 15 = 24

x = 24 : 3 = 8

sai đề nha 75 sao trừ được 375