a)x=243:3                           b) 5x=56:625                      c)2x=128:24                         d)3x+2=18:2

   x=81                                     5x=28/263                        2x=16/3                                  3x+2=9

                                                x=28/263:5                          x=16/3:2                               3x=9-2

                                                x=28/1315                           x=8/3                                     3x=7=>x=7/3  

a) 3x = 243 

      x = 243 : 3 

      x = 81 

b ) 56 : 5x = 625 

            5x = 56 : 625 

            5x = 56/625

              x = 56/625 : 5 

              x = 56/3125

a) <=>5x-x=57+7

<=> 4x=64

<=> x=16

b) <=>4x=28+12

<=> x=40/4

<=>10

c) th1 x=0

th2 x-3=0

<=>x=3

d) th1 2x-4=0

<=> x=2

th2 x+1=0

<=> x=-1

câu e mình ko biết làm hihi 

a, 5x - 7 = x + 57

5x - x = 57 + 7

4x = 64

x = 64 : 4

x = 16

b, x + 3x - 12 = 28

4x = 28 + 12

4x = 40

x = 10

c, x(x-3) = 0

\(\Rightarrow\orbr{\begin{cases}x=0\\x-3=0\end{cases}\Rightarrow\orbr{\begin{cases}x=0\\x=3\end{cases}}}\)

d, (2x-4)(x+1)=0

\(\Rightarrow\orbr{\begin{cases}2x-4=0\\x+1=0\end{cases}\Rightarrow\orbr{\begin{cases}x=2\\x=-1\end{cases}}}\)

e, 1+2+...+x=120

=> \(\frac{x\left(x+1\right)}{2}=120\)

=> x(x+1) = 120.2

=>x(x+1) = 240

=> x(x+1) = 15.16

=> x=16

a: =3x^3-15x^2+21x

b: =-x^3+6x^2+5x-4x^2-24x-20

=-x^3+2x^2-19x-20

c: =9x^2+15x-3x-5-7x^2-14

=2x^2+12x-19

d: =10x^2-4x+2/3

a,  3 x + 1 : 3 4 = 81

3 x - 3 = 3 4

x – 3 = 4

x = 7

Vậy x = 7

b,  3 x + 3 . 3 x + 1 = 729

3 2 x + 4 = 3 6

2x + 4 = 6

x = 1

Vậy x = 1

c,  2 x + 3 . 2 x = 128

2 2 x + 3 = 2 7

2x + 3 = 7

x = 2

Vậy x = 2

d,  23 + 3 x = 5 6 : 5 3

23 + 3 x = 5 3

23 + 3x = 125

3x = 102

x = 34

Vậy x = 34

e,  2 x + 2 x + 4 = 272

2 x + 2 x . 2 4 = 272

2 x ( 1 + 2 4 ) = 272

2 x . 17 = 272

2 x = 16

2 x = 2 4

x = 4

Vậy x = 4

a. (3x - 1).(2x + 7) - (x + 1).(6x - 5) = 16
<=> 6x^2 + 19x - 7 - (6x^2 + x - 5) = 16
<=> 18x - 2 = 16
<=> 18x = 18
<=> x = 1
b. (10x + 9).x - (5x - 1).(2x + 3) = 8
<=> 10x^2 + 9x - (10x^2 + 13x - 3) = 8
<=> -4x + 3 = 8
<=> -4x = 5
<=> x = -5/4
c. (3x - 5).(7 - 5x) + (5x + 2).(3x - 2) - 2 = 0
<=> -15x^2 + 46x - 35 + 15x^2 - 4x - 4 - 2 = 0
<=> 42x - 41 = 0
<=> x = 41/42

a) \(58+7x=100\)

\(=>7x=100-58\)

\(=>7x=42\)

\(=>x=42:7\)

\(=>x=6\)

b) \(3x-7=28\)

\(=>3x=28+7\)

\(=>3x=35\)

\(=>x=35:3\)

\(=>x=\dfrac{35}{3}\)

c) \(x-56:4=16\)

\(=>x-14=16\)

\(=>x=16+14\)

\(=>x=30\)

d) \(101+\left(36-4x\right)=105\)

\(=>36-4x=105-101\)

\(=>36-4x=4\)

\(=>4x=36-4\)

\(=>4x=32\)

\(=>x=32:4\)

\(=>x=8\)

e) \(\left(x-12\right):12=12\)

\(=>x-12=12.12\)

\(=>x-12=144\)

\(=>x=144-12\)

\(=>x=132\)

f) \(\left(3x-2^4\right).7^3=2.7^4\)

\(=>3x-2^4=2.7^4:7^3\)

\(=>3x-16=2.7=14\)

\(=>3x=14+16\)

\(=>3x=30\)

\(=>x=30:3\)

\(=>x=10\)

i) \(\left(10+2x\right).4^{2011}=4^{2013}\)

\(=>10+2x=4^{2013}:4^{2011}\)

\(=>10+2x=4^2=16\)

\(=>2x=16-10\)

\(=>2x=6\)

\(=>x=6:2\)

\(=>x=3\)

\(#WendyDang\)

a) 3^3x+1 . 5 = 10935

=> 3^3x . 3 . 5 = 10935

=> 27^x . 3 . 5 = 10935

=> 27^x = 729

=> 27^x = 27²

=> x = 2

b) 2^{5x + 1} . 3 = 6144

=> 2^5x . 2 . 3 = 6144

=> 32^x . 6 = 6144

=> 32^x = 1024

=> 32^x = 32²

=> x = 2

c) (2x + 3)⁴ = 625

=> (2x + 3)⁴ = (\(\pm\)5)⁴

=> \(\orbr{\begin{cases}2x+3=5\\2x+3=-5\end{cases}}\Rightarrow\orbr{\begin{cases}x=1\\x=-4\end{cases}}\)

d) (3x + 1)³ = 343

=> (3x + 1)³ = 7³

=> 3x + 1 = 7 => 3x = 6 => x = 2

a) 3^{3x + 1}. 5 = 10935

3^3x+1 = 10935 : 5

3^3x+1 = 2187

3^3x+1 = 3⁷

=> 3x + 1 = 7

      3x = 7 - 1

      3x = 6

        x = 6:3

   => x = 2

a) \(3^{3x+1}\cdot5=10935\)

\(\Leftrightarrow3^{3x+1}=2187=3^7\)

\(\Rightarrow3x+1=7\)

\(\Leftrightarrow3x=6\)

\(\Rightarrow x=2\)

b) \(2^{5x+1}\cdot3=6144\)

\(\Leftrightarrow2^{5x+1}=2048=2^{11}\)

\(\Leftrightarrow5x+1=11\)

\(\Leftrightarrow5x=10\)

\(\Rightarrow x=2\)

a) x = 4                

b) x = 7     

c) x = 2                

d) x = 5

e) x = 2                

f) x= 1. 

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