a: =>x-8=27

hay x=35

3.(x-8) = 106-25

3.(x-8) = 81

x-8 = 81:3

x-8 = 27

x=35

\(a,25+3\left(x-8\right)=106\\ 3\left(x-8\right)=81\\ x-8=27\\ x=35\)

3² . (x + 4 ) - 5² = 5 . 2²

9  . ( x + 4 ) - 25 = 20

9 . ( x + 4 )        = 20 + 25

9 . ( x + 4 )        = 45

     ( x + 4 )       = 45 : 9

      x  + 4          = 5

      x                 = 5 - 4

      x                 = 1

(26-3x):5=106-102=4

26-3x=4.5=20

3x=26-20=6

x=6:3

x=2

\(102+\left(26-3.x\right):5=106\)

\(\left(26-3x\right):5=106-102=4\)

\(26-3x=4.5=20\)

\(3x=26-20=6\)

\(x=6:3=2\)

25+3(x-8)=106

25+3x-24=106

3x=106-25+24

3x=105

x=105/3

x=35

Vậy x=35

\(3^2\left(x+4\right)-5^2=5.2^2\)

\(9\left(x+4\right)-25=20\)

\(9x+36-25=20\)

\(9x=20-36+25\)

\(9x=9\)

\(x=1\)

Vậy x=1

25+3(x-8)=106

3(x-8)=106-25

3(x-8)=81

x-8=81:3

x-8=27

x=27+8

x=35

Bài 2

3^2(x+4)-5^2=5.2^2

9(x+4)-25=5.4

9(x+4)-25=20

9(x+4)=25+20

9(x+4)=45

x+4=45:9

x+4=5

x=5-4

x=1

Nếu saj cko mjk xl nke!

Tìm x , biết : 

25 + 3 . ( x - 8 ) = 106 

<=> 3 . ( x - 8 ) = 106 - 25 

<=> 3 . ( x - 8 ) = 81 

<=> x - 8 = 81 : 3 

<=> x - 8 = 27 

<=> x = 27 + 8 

<=>  x = 35

Vậy x = 35

3^2 . ( x + 4 ) - 5^2 = 5 . 2^2 

<=> 9 . ( x + 4 ) - 25 = 5 . 4 

<=> 9 . ( x + 4 ) - 25 = 20 

<=> 9 . ( x + 4 ) = 20 + 25 

<=> 9 . ( x + 4 ) = 45 

<=> x + 4 = 45 : 9 

<=> x + 4 = 5 

<=> x = 5 - 4 

<=> x = 1 

Vậy x = 1

\(135-5\cdot\left(x+4\right)=35\)

\(5\cdot\left(x+4\right)=135-35\)

\(5\cdot\left(x+4\right)=100\)

\(x+4=100:5\)

\(x+4=20\)

\(x=20-4\)

\(x=16\)

b) \(25+3\cdot\left(x-8\right)=106\)

\(3\cdot\left(x-8\right)=106-25\)

\(3\cdot\left(x-8\right)=81\)

\(x-8=81:3\)

\(x-8=27\)

\(x=27+8\)

\(x=35\)

c) \(3^2\cdot\left(x+4\right)-5^2=5\cdot2^2\)

\(9\cdot\left(x+4\right)-25=5\cdot4\)

\(9\cdot\left(x+4\right)-25=20\)

\(9\cdot\left(x+4\right)=20+25\)

\(9\cdot\left(x+4\right)=45\)

\(x+4=45:9\)

\(x+4=5\)

\(x=5-4\)

\(x=1\)

Chúc bạn học tốt!!!!!!!!!!!!!!!!!!!!

a)\(51-\left(3+x\right)=26\\ \Leftrightarrow51-3-x=26\\ \Leftrightarrow x=51-3-26\\ \Leftrightarrow x=22\)

b)Ta có:\(Ư_{\left(24\right)}=\left\{1;2;3;4;6;8;12;24\right\}\)

mà x>10⇒x=\(\left\{12;24\right\}\)

c)\(5.2^2-\left(18:3+2021^0\right)=5.4-6=20-6=14\)

a) 135 - 5(x + 4) = 35 

<=> 135 - 5x - 20 = 35

<=> 115 - 5x = 35

<=> 5x = 115 - 35 

<=> 5x = 80 

<=> x = 16

b) 25 + 3 (x - 8) = 106

=>        3 ( x - 8) = 106 - 25

=>        3 ( x - 8) = 81

=>           ( x - 8) = 81: 3

=>             x - 8  = 27

=>             x       = 27 + 8

=>             x       = .......

a)  135-5(x+4)=35

5(x+4)=135-35

5(x+4)=100

x+4=100:5

x+4=20

x=20-4

x=16

b)25+3(x-8)=106

  3(x-8)=106-25

3(x-8)=81

x-8=81:3

x-8=27

x=27+8

x=35

m, 2(x-51)=2.2^3+20

2(x-51)=2.6+20

2(x-51)=32

x-51=32:2

x-51=16

x =16+51

x =67

n, 450:(x-19)=50

x-19 =450:50

x-19 =9

x =9+19

x =28

o, 4(x-3)=7^2-1^10

4(x-3)=49-1

4(x-3)=48

x-3 =48:4

x-3 =12

x =12+3

x =15

p, 135-5(x+4)=35

5(x+4) =135-35

5(x+4) =100

x+4 =100:5

x+4 =20

x =20-4

x =16

q, 25+3(x-8)=106

3(x-8) =106-25

3(x-8) =81

x-8 =81:3

x-8 =27

x =27+8

x =35

r, 3^2(x+4)-5^2=5.2^2

9(x+4)-25=20

9(x+4) =20+25

9(x+4) =45

x+4 = 45:9

x+4 =5

x =5-4

x =1

p, 135 - 5(x+4) = 35

⇒ 5(x+4) = 135 - 35

⇒ 5(x+4) = 100

x + 4 = 100 : 5

x + 4 = 20

x = 20 - 4

x = 16

Vậy : x=16

đề bài là : Tìm x nhé ( vội quá quên đề ahihi)

ko biet

1/5.2^x+1/3.2^x.2=1/5.2^7+1/3.2^7.2

2x(1/5+1/3.2)=2^7(1/5+1/3.2)

=>2^x=2^7
=> x=7