a) 541 + ( 281 - x ) =735

=>281-x=735-541

=>281-x=194

=>x=87

b)5.(x+35) = 515

=>x+35=515:5

=>x+35=103

=>x=68

c)96 - 3.( 9x+1) =42

=>3(9x+1)=96-42

=>3(9x+1)=54

=>9x+1=18

=>9x=17

=>x=17/9

d)12x-33=3²*3³

=>12x-33=9*27

=>12x-33=243

=>12x=276

=>x=23

a 24

b 68

c 17

d 23

a) \(541+\left(281-x\right)=735\)

\(\Rightarrow281-x=735-541\)

\(\Rightarrow x=281-194\)

\(\Rightarrow x=87\)

b) \(5\cdot\left(x+35\right)=515\)

\(\Rightarrow x+35=515:5\)

\(\Rightarrow x=103-35\)

\(\Rightarrow x=68\)

c) \(96-3\cdot\left(9x+1\right)=42\)

\(\Rightarrow3\cdot\left(9x+1\right)=96-42\)

\(\Rightarrow9x+1=54:3\)

\(\Rightarrow9x=18-1\)

\(\Rightarrow x=17:9\)

\(\Rightarrow x=\frac{17}{9}\)

d) \(12x-33=3^2\cdot3^3\)

\(=12x-33=243\)

\(\Rightarrow12x=243+33\)

\(\Rightarrow x=276:12\)

\(\Rightarrow x=23\)

a) 5x - 14 = x - 34

5x - x = -34 + 14

4x = -20

x = -20 : 4

x = -5

b) x - 3 - (3x + 2) = -15

x - 3 - 3x - 2 = -15

x - 3x = -15 + 3 + 2

-2x = -10

x = (-10) : (-2)

x = 5

c) 2(x  - 12) + 19 = x + (-34)

2x - 24 + 19 = x + (-34)

2x - x = -34 + 24 - 19

x = -29

d) 2(x - 33) - 3(x - 43) = 96 - 115

2x - 66 - 3x + 129 = 96 - 115

2x - 3x = 96 - 115 + 66 - 129

-x = -82

x = 82

e) 2x + 3 - 9x = -11

2x - 9x = -11 - 3

-7x = -14

x = (-14) : (-7)

x = 2

f) -(x + 3 - 84) = (x + 70 - 71) - 6

-x - 3 + 84 = x + 70 - 71 - 6

-x - x = 70 - 71 - 6 - 84

-2x = -91

x = (-91) : (-2)

x = 45,5

a: Ta có: \(7x+25=144\)

\(\Leftrightarrow7x=119\)

hay x=17

b: Ta có: \(33-12x=9\)

\(\Leftrightarrow12x=24\)

hay x=2

c: Ta có: \(128-3\left(x+4\right)=23\)

\(\Leftrightarrow3\left(x+4\right)=105\)

\(\Leftrightarrow x+4=35\)

hay x=31

d: Ta có: \(71+\left(726-3x\right)\cdot5=2246\)

\(\Leftrightarrow5\left(726-3x\right)=2175\)

\(\Leftrightarrow726-3x=435\)

\(\Leftrightarrow3x=291\)

hay x=97

e: Ta có: \(720:\left[41-\left(2x+5\right)\right]=40\)

\(\Leftrightarrow41-\left(2x+5\right)=18\)

\(\Leftrightarrow2x+5=23\)

\(\Leftrightarrow2x=18\)

hay x=9

Bn cần bài nào vậy

f: Ta có: \(10-4x+120:8=16+1\)

\(\Leftrightarrow4x=17-25=-8\)

hay x=-2

g: Ta có: \(x+9x+7x+5x=2244\)

\(\Leftrightarrow22x=2244\)

hay x=102

h: Ta có: \(\left(x+1\right)+\left(x+2\right)+\left(x+3\right)+...+\left(x+100\right)=5750\)

\(\Leftrightarrow100x+5050=5750\)

\(\Leftrightarrow100x=700\)

hay x=7

(9\(x\) - 2³) : 5 = 2

9\(x\) - 8 = 2 x 5 

9\(x\) - 8  = 10

9\(x\)         = 18

  \(x\)          = 2

3\(x\) .(8² - 2.(2⁵ - 1)] = 2022

3\(x\) .(64 - 2.31) = 2022

3\(x\).(64 - 62) = 2022

3\(x\).2 = 2022

 \(x\)          = 2022 : 2

\(x\)          = 1011

[ 3⁴ - (8² + 14):13]. \(x\) = 5² + 10²

[81 - 78:13].\(x\) = 125

75.\(x\) = 125

     \(x\) = 125: 75

     \(x\) = \(\dfrac{5}{3}\)

\(\Leftrightarrow\sqrt{9x^2+16x+96}=3x-16y-24\)

Vế phải nguyên \(\Rightarrow\) vế trái nguyên

\(\Rightarrow9x^2+16x+96=k^2\)

\(\Rightarrow81x^2+144x+864=\left(3k\right)^2\)

\(\Leftrightarrow\left(9x+8\right)^2+800=\left(3k\right)^2\)

\(\Leftrightarrow\left(3k-9x-8\right)\left(3k+9x+8\right)=800\)

Pt ước số thật kinh dị với số ước của 800 

Ta có \(9x^2+16x+96=\left(3x-24-16y\right)^2\)

\(\Leftrightarrow9x^2+16x+96=9x^2-6x\left(16y+24\right)+\left(16y+24\right)^2\)\(\Leftrightarrow16x+96=\left(16y+24\right)\left(16y+24-6x\right)\)

\(\Leftrightarrow8\left(2x+12\right)=4\left(4y+6\right).2\left(8y+12-3x\right)\)

\(\Leftrightarrow2x+12=\left(4y+6\right)\left(8y+12-3x\right)\)\(\Leftrightarrow2x+12=32y^2+48y-12xy+48y+72-18x\)

\(\Leftrightarrow32y^2+96y-12xy-20x+60=0\)\(\Leftrightarrow32y^2+96y+60=12xy+20x\)\(\Leftrightarrow8y^2+24y+15=3xy+5x\)

\(\Leftrightarrow8y^2+24y+15=x\left(3y+5\right)\)\(\Leftrightarrow x=\dfrac{8y^2+24y+15}{3y+5}\)

\(\Leftrightarrow9x=\dfrac{9\left(8y^2+24y+15\right)}{3y+5}=\dfrac{72y^2+216y+135}{3y+5}\)\(=\dfrac{\left(72y^2+120y\right)+\left(96y+160\right)-25}{3y+5}\)\(=24y+32-\dfrac{25}{3y+5}\)

\(\Leftrightarrow24y+32-\dfrac{25}{3y+5}\in Z\)\(\Rightarrow3y+5\in U\left(25\right)=\left\{\pm1,\pm5,\pm25\right\}\)\(\Leftrightarrow3y\in\left\{-4,-6,-10,0,-30,20\right\}\)\(\Rightarrow y\in\left\{-2,-10,0\right\}\)

+) Với y=-2=> x=1

+) với y=-10=> x=-23    

Vậy pt cho 2 cặp (x,y) nguyên =(1,-2),(-23,-10)

a,\(96-3x+1=42\)

<=> 97-3x=42

<=> 3x=55

<=>x=\(\frac{55}{3}\)

vậy.......

b, 15x-9x+2x=72

<=>8x=72

<=>x=9

vậy.....

c,\(3^{x+2}+3^x=10\)

\(\Leftrightarrow3^x\left(3^2+1\right)=10\)

\(\Leftrightarrow3^x=1\)

\(\Leftrightarrow x=0\)

vậy........

a 96 - 3 . x +1 = 42

96-3.x= 42-1

96 - 3 . x = 41

3.x= 96-41

3.x= 55 

x= 55 : 3 

x= \(\frac{55}{3}\)

b, 15x - 9x + 2x = 72 

x.( 15-9+2) = 72 

x8=72

x=72:8

x=9

c,  3^x+2 + 3^x = 10

  \(\Rightarrow3^x.9+3^x=10\)

\(\Rightarrow3^x.10=10\)

\(\Rightarrow3^x=1\)

\(\Rightarrow x=0\)

a)96-3.x+1=42

         3.x+1=96-42

          3.x+1=54

              x+1=54:3

              x+1=18

              x=18-1

              x=17

96 - 3( x + 1 ) = 42

      3( x + 1 )  = 96 - 42

      3( x + 1 )  = 54

          x + 1    = 54 : 3 = 18

                 x   = 18 - 1 

                 x   = 17 

cau 1 

96-3(x+1)=42

=> 3(x-1)=54

=> x-1=18

=> x=19

cau 2 

12x-33=3².3³

=> 12x-33=243

=> 12x=276

=> x=23

12x - 33 = 3² . 3³

12x - 33 = 3⁵ = 243

      12x  = 243 + 33

       12x = 276

          x  = 276 : 12

          x  = 23

Tìm x:

a, 96 - 3 . ( x + 1 ) = 42

           3 . ( x + 1 ) = 96 - 42

           3 . ( x + 1 ) = 54

             x + 1 = 54 : 3

             x + 1 = 18

                   x = 18 -1 

                   x = 17

 b, 12x - 33 = 32.33

      12x - 33 =9 . 27

      12x - 33 = 243

             12x = 243 + 33

             12x = 276

               x=276:12

               x=23

a, 96 - 3 . ( x + 1 ) = 42

3 . ( x + 1 ) = 96 - 42

3 . ( x + 1 ) = 54

x + 1 = 54 : 3

x + 1 = 18

x = 18 - 1

x = 17

b, 12x - 33 = 3² . 3³

12x - 33 = 9 . 27

12x - 33 = 243

12x = 243 + 33

12x = 276

x = 276 : 12

x = 23

a)96-3.(x+1)=42

3.(x+1) = 96 - 42

3 . (x+1) = 54

x + 1 = 54 : 3

x + 1 = 18

x = 18-1

x = 17

a) 54 + ( 218 - x ) = 735

218 - x = 735 - 34

218 - x = 701

        x = 218 - 701

        x = -483

b) 96 - 3 ( x + 1 ) = 42

3 ( x + 1 ) = 96 - 42

3 ( x + 1 ) = 54

x + 1 = 54 : 3

x + 1 = 18

      x = 18 - 1

      x = 17

c) 5 ( x + 35 ) 515

x + 35 = 515 : 5

x + 35 = 103

       x  = 103 - 35

       x  = 68

d) 12x - 33 = 3² . 3²

12x - 33 = 9.9

12x - 33 = 81

12x = 81 + 33

12x = 114

    x = 114 : 12

    x = 9,5

a) 54+(218-x)=735

          218-x=681

                x=-463

b) 96-3(x+1)=42

         3(x+1)=54

           x+1=18

           x=17

c) 5(x+35)=515

      x+35=103

       x=68

d) 12x-33=3^2.2^2

     12x-33=81

      12x = 114

          x=9,5

Nhấn đúng cho mk nha!!!!!!!!

ồ

dễ nhỉ

thế cũng hỏi sao

k mk nha

k mk mk k lại

a)12x-33=3².3³

12x-33=243

12x=243+33

12x=276

x=276/12

x=23

a) 12x - 33 = \(3^2.3^3\)

\(\Rightarrow12x-33=3^5\)

\(\Rightarrow12x-33=243\)

\(\Rightarrow12x=243+33\)

\(\Rightarrow12x=276\)

\(\Rightarrow x=276:12\)

\(\Rightarrow x=23\)

b 96 - 3 (x + 10) = 42

\(\Rightarrow3\left(x+10\right)=96-42\)

\(\Rightarrow3\left(x+10\right)=54\)

\(\Rightarrow x+10=54:3\)

\(=>x+10=17\)

\(\Rightarrow x=17-10\)

\(\Rightarrow x=7\)

a)  12x - 33 = 3^2 . 3^3

     12x - 33 = 243

        12x     = 243 + 33

         12x    = 276

            x     = 276 : 12

            x     =  23

b)   96 - 3( x + 10 ) = 42

             3( x + 10 ) = 96 - 42

             3( x + 10 ) = 54

                x + 10    = 54 : 3

                x + 10    = 18

                  x          = 18 - 10

                  x          = 8