$(5x-39).7+3=80$

$\Rightarrow (5x-39).7=77$

$\Rightarrow 5x-39=11$

$\Rightarrow 5x=50$

$\Rightarrow x=10$

Vậy$x=10$

Làm chi tiêt hơn ạ.

(5x - 39 ) . 7 + 3 = 80

( 5x - 39 ) .7 = 80 - 3

( 5x - 39 ) . 7 = 77

5x - 39 = 77:7

5x - 39 = 11

5x = 39 + 11

5x = 50

x = 50 : 5

x = 10

Vậy x = 10

kb với mình đi nguyen huyen trang

1/ x=12

2/ x=10     nhớ tít đó nha

3/ x=-4

làm hẳn các bước đc ko các bạn

210 - 5 ( x - 10 ) = 200

5 ( x - 10 ) = 210 - 200

5 ( x - 10 ) = 10

x - 10 = 10 : 5

x - 10 = 2

x = 2 + 10

x = 12

( 5x - 39 ) . 7 + 3 = 80

( 5x - 39 ) . 7 = 80 - 3

( 5x - 39 ) . 7 = 77

5x - 39 = 77 : 7 

5x - 39 = 11

5x = 11 + 39

5x = 50

x = 50 : 5

x = 10

( 2x + 1 ) : 7 = 2³ + 3²

( 2x + 1 ) : 7 = 8 + 9

( 2x + 1 ) : 7 = 17

2x + 1 = 17 . 7

2x + 1 = 119

2x = 119 - 1

2x = 118

x = 118 : 2

x = 59

Huy làm sai r nhé

Thử lại:

(2. 59 + 1) = 119 : 7 = 17

a) x = 2

b) x = 7.

c) x = 12

d) x = 45

e) x = 18.

f) x  = 10

a) x = 2.               

b) x = 7.

c) x= 12.

d)  x= 45.

e) x = 18.

f) x  = 10.

a)210-5x=200

5x=210-200

5x=10

x=10:2

x=5

B)210-5(x-10)=200

5(x-10)=210-200

5(x-10)=10

x-10=10:5=2

x=2+10=12

c)450:[41-(2x-5)]=3 mũ 2 .5

450:[41+5-2x]=45

41+5-2x=450:45

41+5-2x=10

2x=36

x=18

D)210:x-10=20

210:x=20+10

210:x=30

x=210:30

x=7

E)(5x-39).7+3=80

(5x-39).7=77

5x-39=11

5x=50

x=10

F(2x+1):7=2 mũ 2 nhân 3 mũ 2

(2x+1):7=36

2x+1=252

2x=251

x=251/2

( 5x - 9 ) . 7 + 3 = 80

( 5x - 9 ) . 7 = 80 - 3 = 77

5x - 9 = 77 : 7 = 11

5x = 11 + 9 = 20

x = 20 : 5 = 4

(5x-9).7+3 =80

=>(5x-9).7=77

=>5x-9=11

=>5x=20

=>x=4

Đs:

1.a =16290

2. x=10

3.  8^34  >   4^50

giải chi tiết nha

(2x-39).7+3=80

(2x-39).7=80-3

(2x-39).7=77

2x-39=77:7

2x-39=11

2x=11+39

2x=50

x=50:2

x=25

(2x-39).7+3=80

(2x-39).7 =80-3

(2x-39).7 =77

2x-39 =77:7

2x-39 =11

2x =11+39

2x =50

x =50:2

x =25

Vậy x = 25.

guiut