a: =>1/3:x=3/5-2/3=9/15-10/15=-1/15

=>x=-1/3:1/15=5

b: \(\Leftrightarrow x\cdot\dfrac{2}{3}-3=\dfrac{2}{5}\cdot\left(-10\right)=-4\)

=>x*2/3=-1

=>x=-3/2

c: =>2x+1=4 hoặc 2x+1=-4

=>x=3/2 hoặc x=-5/2

h: =>x-3=4

=>x=7

g: =>2x-1=3

=>2x=4

=>x=2

f: \(\Leftrightarrow x\cdot\left(\dfrac{3}{2}-\dfrac{7}{3}\right)=\dfrac{3}{2}-\dfrac{2}{3}\)

=>x*-5/6=5/6

=>x=-1

d: =>|2x-1|=3

=>2x-1=3 hoặc 2x-1=-3

=>x=-1 hoặc x=2

\(4.\left(3-2x\right)^2=\frac{1}{81}\)

\(\left(3-2x\right)^2=\frac{1}{324}\)

\(\Leftrightarrow\orbr{\begin{cases}3-2x=\frac{1}{18}\\3-2x=\frac{-1}{18}\end{cases}\Leftrightarrow\orbr{\begin{cases}x=\frac{53}{36}\\x=\frac{55}{36}\end{cases}}}\)

Vậy \(x\in\left\{\frac{53}{36};\frac{55}{36}\right\}\)

Cảm ơn nhé!

zko có gì

a, 2^x-1 = 64

=> 2^x-1 = 2⁶

=> x - 1 = 6

=> x = 6 + 1 

=> x = 7

b, 3^2x-10 = 81

=> 3^2x-10 = 3⁴

=> 2x - 10 = 4

=> 2x = 14

=> x = 7

c, 2^2x+3 = 1024

=> 2^2x+3 = 2¹⁰

=> 2x + 3 = 10

=> 2x = 7

=> x = \(\frac{7}{2}\)

a) x + 2006 = 2021

x= 2021 - 2006

x= 15

b) 2x - 2016 = 2 ⁴  . 4

2x - 2016 = 64

2x = 64 + 2016

2x = 2080

x= 2080 : 2

x= 1040

c) 3. ( 2x + 1) ³ =81

( 2x-1)³ = 27

( 2x-1)³ = 3³

^{=> 2x-1 = 3}

^{2x= 2}

^{x= 1}

a, \(x\) + 2006 = 2021

    \(x\)             = 2021 - 2006

     \(x\)             = 15

b, 2\(x\) - 2016 = 2⁴.4

    2\(x\) - 2016  = 64

    2\(x\)               = 64 + 2016

    2\(x\)                = 2080

      \(x\)                = 2080 : 2

       \(x\)                = 1040

a, => 3^2x = 3^4

=>2x=4

=>x=2

b,=>2x+3x-3=17

=>5x-3=17

=>5x=17+3=20

=>x=4

c,=>x+15=(2x+3).2 = 4x+6

=>4x+6-(x+15)=0

=>4x+6-x-15=0

=>3x-9=0

=>3x=9

=>x=3

k mk nha

a,x=2

b,

a) 3^2x = 81

     3^2x = 3^4

     2x     = 4

       x      = 4:2

       x = 2

b) 2x + 3 . (x - 1) = 17

     2x + 3x - 3.1 = 17

     (2+3)x - 3 = 17

     5x              = 17 + 3

     5x              = 20

       x              = 20:5

       x              = 4

c) (x + 15) : 2 = 2x + 3

(x+15).1/2 = 2x + 3

(1/2)x + (1/2).15 = 2x + 3

(1/2)x + 15/2 = 2x + 3

(1/2)x - 2x = 3 - (15/2)

(1/2 - 2)x = -9/2

(-3/2)x = -9/2

x = (-9/2):(-3/2)

x = 3