Cậu dùng máy tính dùng shift solve là đc

Kết quả

a, 19/12

b, 5

GIẢI NGUYÊN CÂU ĐI

Ta có : 3(2x - 4) + 11 = -11

=> 3(2x - 4) = 0

Mà 3 khác 0 

Nên : 2x - 4 = 0

=> 2x = 4

=> x = 2

a,\(\left(x-15\right):50+22=24\)

\(< =>\frac{\left(x-15\right)}{50}=2< =>x-15=100\)

\(< =>x=100+15=115\)

b,\(42-\left(2x+32\right)+12:2=6\)

\(< =>42-2x-32=0\)

\(< =>10-2x=0< =>x=\frac{10}{2}=5\)

Làm nốt :

c) \(134-2\left\{156-6\cdot\left[54-2\cdot\left(9+6\right)\right]\right\}\cdot x=86\)

=> 134 - 2{156 - 6 . [54 - 2 . 15]} . x = 86

=> 134 - 2{156 - 6 . [54 - 30]} . x = 86

=> 134 - 2{156 - 6. 24} . x = 86

=> 134 - 2{156 - 144} . x = 86

=> 134 - 2.12 . x = 86

=> 134 - 24 . x = 86

=> 24.x = 48

=> x = 2

Bài 2 : a) 120 : [21 - (4x - 4)] = 2³.3

=> 120 : [21 - (4x - 4)] = 8.3

=> 120 : [21 - (4x - 4)] = 24

=> 21 - (4x - 4) = 5

=> 4x - 4 = 16

=> 4x = 20

=> x = 5

b) 3.[205 - (x - 9)] - 486 = 0

=> 3.[205 - (x - 9)] = 486

=> 205 - (x - 9) = 162

=> x - 9 = 205 - 162 = 43

=> x = 43 + 9 = 52

c) 204 - 2{200 - 5.[64 - 2.(11 + 6)]} . x = 4

=> 204 - 2{200 - 5.[64 - 2.17]} . x = 4

=> 204 - 2{200 - 5 .[64 - 34]}.x = 4

=> 204 - 2{200 - 5.30} . x = 4

=> 204 - 2{200 - 150}.x = 4

=> 204 - 2.50 . x = 4

=> 2.50.x = 200

=> 100.x = 200

=> x = 2

Câu 1: \(20⋮x\)=> \(x\inƯ\left(20\right)=\left\{\pm1;\pm2;\pm4;\pm5;\pm10;\pm20\right\}\)

Câu 2: 2x + 9 = 2019

           2x       = 2019 - 9

           2x       = 2010

           x         = 2010 : 2

           x         = 1005

Câu 3: 6x - 39 = 5628 : 28

            6x - 39 = 201

            6x        = 201 +39

            6x        = 240

             x         = 240 : 6

             x         = 40

Câu 4: 2^x+1 + 54 = 86

           2^x+1         = 86 - 54 = 32

           2^x+1         = 2⁵

      =>x+1 = 5

      =>x=4

42 -(2x + 32) + 12 :2 =6

42 - 2x - 32 + 6 = 6

42 - 2x - 32 = 0

42 - 2x = 32

2x = 42 - 32 = 10

x = 5

134 - 2 . {156 - 6.[54 -2.(9+6) ] } x = 86

134 - 2.{ 156 - 6.[54 - 2 . 15 ]} x = 86

134 - 2.{ 156 - 6 . 24} x = 86

134 - 2. 12 .x = 86

134 - 24x = 86

24x = 48

x = 2 

\(42-\left(2x+32\right)+12:2=6\)

\(\Rightarrow42-2x-32=0\)

\(\Rightarrow2x=10\)

\(\Rightarrow x=5\)

134 - 2 . {156 - 6[54 - 2(9 + 6)]} . x = 86

134 - 2 . { 156 - 6 [ 54 - 2 . 15 ) ] } . x = 86

134 - 2 . { 156 - 6 [ 54 - 30 ] } . x         = 86

134 - 2 . { 156 - 6 . 24 } . x                  = 86

134 - 2 . { 156 - 144 } . x                      = 86

134 - 2 .       21          . x                       = 86

         2 .     21   . x                                 = 134 - 86

         2  .    21    . x                                 =  48

                   21 . x                                   = 48 : 2 

                    21  . x                                  = 24

                               x                                = 24 : 21

                              x                                   = 1

(x-1)^3= 27

=> (x-1)^3=3^3

=> x-1=3

=>x=3+1

=> x=4

12x-10x+54=86
(12-10)x+54=86

2x+54=86

2x=86-54

2x=32

x=32:2

x=16

dmm

a: \(\left(x+1\right)^3+\left(x-2\right)^3=2x^3+2\left(2x-1\right)^2-9\)

\(\Leftrightarrow x^3+3x^2+3x+1+x^3-6x^2+12x-8=2x^3+2\left(4x^2-4x+1\right)-9\)

\(\Leftrightarrow2x^3-3x^2+15x-7=2x^3+8x^2-8x-7\)

\(\Leftrightarrow-11x^2+23x=0\)

\(\Leftrightarrow x\left(-11x+23\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x=\dfrac{23}{11}\end{matrix}\right.\)