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16 tháng 7 2023

( 3x - 24 ) . 73 = 2 . 74

3x - 16 = 2 . 74 : 73 = 14

3x = 14 + 16 = 30

x = 10

16 tháng 7 2023

\(\left(3\times x-2^4\right)\times7^3=2\times7^4\)

 \(\left(3\times x-2^4\right)\div2=7^4\div7^3\) 

  \(\left(3\times x-16\right)\div2=7\)

           \(3\times x-16=7\times2\) 

           \(3\times x-16=14\) 

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

                      \(3\times x=30\)

                           \(x=30\div3\) 

                           \(x=10\)

7 tháng 8

  Bài 1:

2\(x\) = 4

2\(^x\) = 22

 \(x=2\)

Vậy \(x=2\)

7 tháng 8

Bài 2:

2\(^x\) = 8

2\(^x\) = 23

\(x=3\)

Vậy \(x=3\)

14 tháng 10 2018

Bo may la binh day k di hieu ashdbfgbgygygggydfsghuyfhdguuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu3

12 tháng 9 2018

a) \(\left(12x-4^3\right).8^3=4.8^4\)

\(12x-4^3=32\)

12x  = 96

x = 8

12 tháng 9 2018

b) \(\left(3x-2^4\right).7^3=2.7^4\)

3x - 24 = 14

3x = 30

x = 10

6 tháng 12 2016

may cai bai day ma cung khong biet oc cho

6 tháng 12 2016

a) 89-(73-x)=20

=>73-x=89-20

=>73-x=69

=>x=73-69

=>x=4

12 tháng 10 2018

a)100-7.[x-5]=58

          7.[x-5]=100-58=42

               x-5=42:7=6

                  x=6+5

                  x=11

b)12.[x-1]:3=43+23

   12 [x-1]:3=64+8

   12.[x-1]:3=72

        [x-1]:3=72:12=6

           [x-1]=6.3=18

                x=18-1

                x=17

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30 tháng 9 2016

a, 100 - 7 ( x - 5 ) = 31 + 33

100 - 7 ( x - 5 ) = 31 + 27

100 - 7 ( x - 5 ) = 58

7 ( x - 5 ) = 100 - 58

7 ( x - 5 ) = 42

x - 5 = 42 : 7

x - 5 = 6

=> x = 6 +5

=> x = 11

Vậy x = 11

b, 12 ( x - 1 ) : 3 = 43 + 23

12 ( x - 1 ) : 3 = 64 + 8

12 ( x - 1 ) : 3 = 72

12 ( x - 1 ) = 72 . 3

12 ( x - 1 ) = 216

x - 1 = 216 : 12

x - 1 = 18

=> x = 18 + 1

=> x = 19

Vậy x = 19

c, 24 + 5x = 75 : 73

24 + 5x = 72

24 + 5x = 49

5x = 49 - 24

5x = 25

=> x = 25 : 5

=> x = 5

Vậy x = 5

d, 5x - 206 = 24 . 4

5x - 206 = 16 . 4

5x - 206 = 64

5x = 64 + 206

5x = 270

=> x = 270 : 5

=> x = 54

Vậy x = 54

e, 125 = x3

53 = x3

=> x = 5

Vậy x = 5

g, 64 = x2

82 = x2

=> x = 8

Vậy x = 8

18 tháng 2

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