\(2x-2^3.3^2=138\)

\(2x-8.9=138\)

\(2x-72=138\)

\(2x=138+72\)

\(2x=210\)

\(x=210:2\)

\(x=105\)

\(\left(6x-3^4\right).7^3=3.7^4\)

\(\left(6x-3^4\right)=3.7^4:7^3\)

\(\left(6x-3^4\right)=3.7\)

\(6x-81=21\)

\(6x=21+81\)

\(6x=102\)

\(x=102:6\)

\(x=17\)

a)2x-138=2³.3²

=>2x-138=72

=>2x       =72+138

=>2x       =210

=>x         =210:2

=>x         =105

b)20-[7(x-3)+4]=2

=>7(x-3)+4       =20-2

=>7(x-3)+4       =18

=>7(x-3)           =18-4

=>7(x-3)           =14

=>x-3                =14:7

=>x-3                =2

=>x                   =2+3

=>x                   =5

c)[6x-39].3.28=5628

=>[6x-39].3    =5628:28

=>[6x-39].3    =201

=>6x-39         =201:3

=>6x-39         =67

=>6x              =67+39

=>6x             =106

=>x               =106:6

=>x               =17,6

cam on ban pe sushi nha

a) \(2x-138=2^2.3^2\)

    \(2x-138=4.9\)

     \(2x-138=36\)

     \(2x=36+138\)

      \(2x=174\)

            \(x=174:2\)

           \(x=87\)

    Vậy \(x=87\)

b) \(20-\left[7.\left(x+3\right)+4\right]=2\)

                  \(\left[7.\left(x+3\right)+4\right]=20-2\)

                   \(7.\left(x+3\right)+4=18\)

                    \(7.\left(x+3\right)=18-4\)

                       \(7.\left(x+3\right)=14\)

                               \(\left(x+3\right)=14:7\)

                               \(x+3=2\)

                                          \(x=2-3\)     

                                           \(x=-1\)

                              Vậy \(x=-1\)

c) \(\left[6x-39\right].3.28=5628\)

\(\left[6x-39\right].84=5628\)

\(\left[6x-39\right]=5628:84\)

\(6x-39=67\)

\(6x=67+39\)

\(6x=106\)

     \(x=106:6\)

      \(x=\frac{53}{3}\)

Vậy \(x=\frac{53}{3}\)

Chúc bạn học tốt !!!

Ta có : (6x - 3⁴) . 7³ = 3.7⁴

=> (6x - 3⁴) = 3.7

=> (6x - 3⁴) = 21

=> 6x - 81 = 21

=> 6x = 102 

=> x = 17

<div style="position:relative;height:0;padding-bottom:56.25%"><iframe src="https://www.youtube.com/embed/koxpMVzDZhk?ecver=2" width="640" height="360" frameborder="0" style="position:absolute;width:100%;height:100%;left:0" allowfullscreen></iframe></div>

Ta thực hiện nhân trước 2.x-2³.3²=138  2.x-8.9=138  2.x-72=138  x=138+72  x=210  x=210:2  x=105

2x - 2³.3² = 138

2x - 72 = 138

2x = 138 + 72

2x = 200

x = 200 ÷ 2

x = 100

( 6.x - 34 ).7³= 3.7⁴

( 6x - 34 ).343 = 7203

6x - 34 = 7203 ÷ 343

6x - 34 = 21

6x = 21 + 34

6x =  55

x = 55 ÷ 6

x = 55/6

a,2x-2³.3²=138

2x-72=138

2x=66

x=66:2

x=33

Vậy x=33

b,(6x-34).7³=3.7⁴

(6x-34).343=7203

6x-34=21

6x=21+34

6x=55

x=55:6

x=\(\frac{55}{6}\)

Vậy x=\(\frac{55}{6}\)

a) \(2x-2^3.3^2=138\)

\(\Rightarrow2x=138+2^3.3^2\)

\(\Rightarrow2x=210\)

\(\Rightarrow x=105\)

Vậy x = 105.

a)2x-96=138

2x=174

x=87

b)(6x-81).343=147

2058x-27783=147

2058x=27930

x=13,57

a ) 2x - 138 = 2 ^ 3 . 3 ^ 2

     2x - 138 = 8 . 9

     2x - 138 = 72

     2x          = 210

       x          = 105

b ) ( 3x - 2 ^ 4 ) . 7 ^ 2 = 2 . 7 ^ 4

     ( 3x - 16 ) . 49         = 4802

     ( 3x - 16 )                = 98

       3x                         = 114

         x                         = 38

a) \(\dfrac{\left(-3\right)^7\cdot2^8}{6^7}\)

\(=\dfrac{-1\cdot3^7\cdot2^8}{\left(2\cdot3\right)^7}=\dfrac{-1\cdot3^7\cdot2^7\cdot2}{2^7\cdot3^7}=-1\cdot2=-2\)

b) \(\dfrac{-3\cdot7^4+7^3}{7^5\cdot6-7^3\cdot2}\)

\(=\dfrac{-3\cdot7\cdot7^3+7^3}{7^3\cdot7^2\cdot6-7^3\cdot2}\)

\(=\dfrac{7^3\left(-3\cdot7+1\right)}{7^3\left(7^2\cdot6-2\right)}=\dfrac{-3\cdot7+1}{7^2\cdot6-2}\)

\(=\dfrac{-21+1}{294-2}=\dfrac{-20}{290}=\dfrac{-2}{29}\)

b) \(\dfrac{5^3\cdot3^5}{5^3\cdot0,5+125\cdot2\cdot5}\)

\(=\dfrac{5^3\cdot3^5}{5^3\cdot0,5+5^3\cdot2\cdot5}=\dfrac{5^3\cdot3^5}{5^3\left(0,5+2\cdot5\right)}\)

\(=\dfrac{3^5}{0,5+2\cdot5}=\dfrac{243}{10,5}=\dfrac{162}{7}\)

a) \(3^x:3^2=243\)

\(3^{x-2}=3^5\)

=> x - 2 = 5

=> x = 7

b) \(6.2^x+3.2^x=2^x.\left(6+3\right)=2^x.9=9.29=261\)

=> 2^x = 9

=> x không tồn tại vì 2 khi nâng lên lũy thừa ra số chẵn.

c) d) tương tự

làm ơn giúp mình ,bạn nào làm nhanh đúng mình chọn cho nhanh nha mọi người

nhanh nha mọi người

T.T

Bài làm

2².4⁴.2⁶.2.2=2².2⁸.2⁶.2²=2¹⁸

2.2³.2⁷.2⁴=2¹⁵

3².3=3³=27

3⁴.3³.3=3⁸

3.3⁵.3⁴.3²=3¹²

3.3⁶.3⁷.3⁴=3¹⁸

4.4³=4⁴

4⁵.4.4⁷=4¹³

4.4³.4⁵.4⁶=4¹⁵

5.5⁶=5⁷

5.5⁴=5⁵

5.5².5⁴=5⁷

5.5³.5⁴.5⁶=5¹⁴

5.5⁶.5⁴.5³=5¹⁴

x.x²=x³

x.x³.x⁵=x⁹

a.a⁴=a⁵

a.a².a⁴.a⁵.a⁷=a¹⁹

a.a³.a⁵.a⁶=a¹⁵

a.a⁴.a.a⁵.a⁶.a=a¹⁸

x.x³.x⁴=x⁸

x⁵.x⁴.x.x⁷.x⁶=x²³

7.7²=7³

7.7².7⁴.7⁵=7¹²

7³.7⁵.7⁴.7=7¹³

7².7.7⁶.7⁶.7³=7¹⁸

10.10²=10³

10.100.10³=10⁶

10.100.10⁴.1000=10¹⁰

10².10⁴.100.1000=10¹¹

Tk nha !