mình không rảnh, bạn nhé.

chỉ cần giải cho mình câu C bài 1 và câu B,C bài 2 thôi nhé

a,

7x – 8 = 713

7x = 713 + 8

7x = 721

x = 721 : 7

x = 103.

b,

2448:[119-(x-6)]=24

119-(x-6)= 2448 : 24

119-(x-6)= 102

x-6= 119-102

x-6= 17

x=17+6

x=23

a) (x+12)-20=0

x+12=20

x=8

b) 5.(x-7)=0

x-7=0

x=7

c) 12x-3x+1=937

12x-3x=936

9x=936

x=104

d) 2448 : [ 119 - ( x - 6 ) ] = 24

119-(x-6) = 102

x-6=17

x=23

a ) ( x + 12 ) - 20 = 0

x + 12 = 0 + 20

x +12 = 20

x = 20 - 12

x = 8

b ) 5 . ( x - 7 ) =0

x - 7 = 0 : 5

x - 7 = 0

x = 0 + 7

x = 7

a, x=23

b, x=54

a, = 23 

b, = 54

nha bạn

a,(6400+2600)-3x=1200

9000-3x=1200

3x=9000-1200

3x=7800

x=7800:3

x=2600

b,(4x-[(8000-3567)-(2031-1598)]=400

(4x-[4433-433]=400

4x-4000=400

4x=400+4000

4x=4400

x=4400:4

x=1100

C;2448:[(119-(x-6)]=24

119-(x-6)=2448:24

119-(x-6)=102

x-6=119-102

x-6=17

x=17+6

x=23

a. (6400+2600) -3x=1200

=> 9000-3x=1200

=> 3x=9000-1200

=> 3x=7800

=> x=7800:3

=> x=2600

b. {4x-[(8000-3567)-(2031-1598)]}=400

=> { 4x-(4433-433)}=400

=> 4x-4000=400

=> 4x=400+4000

=> 4x=4400

=> x=4400:4

=> x=1100

c. 2448:[(119-(x-6)]=24

=> 119-(x-6)=2448:24

=> 119-(x-6)=102

=> x-6=119-102

=> x-6=17

=> x=17+6

=> x=23

Câu 1 : 

a) 7x-8=713

    7x=713+8

    7x=721

    x=721:7

   x=103

Vậy x=103.

b)2448:[119-(x-6)]=24

   119-(x-6)=2448:24

   119-(x-6)=102

   x-6=119-102

   x-6=17

  x=17+6

 x=23

Vậy x=23.

c) 2016-100(x+11)=2⁷:2³

   2016-100(x+11)=2⁴=16

  100(x+11)=2016-16

  100(x+11)=2000

  x+11=2000:100

 x+11=20

  x=20-11

  x=9

Vậy x=9.

Câu 2 :

879.2+879.996+3.879=879(2+996+3)

                                   =879.1001

                                   =879879

`2448:[119-(x-6)]=24`

`=>119-(x-6)= 2448 : 24`

`=>119-(x-6)= 102`

`=> x-6=119-102`

`=> x-6=17`

`=>x=17+6`

`=>x=23`

`2448:[119-(x-6)]=24`

`=>119-(x-6)= 2448 : 24`

`=>119-(x-6)= 102`

`=> x-6=119-102`

`=> x-6=17`

`=>x=17+6`

`=>x=23`

2448 : 24=102

119-102=17

17+6=23

x=23

\(2448:\left[119.\left(x-6\right)\right]=24\)

\(119.\left(x-6\right)=2448:24=102\)

\(x-6=102:119\)

=> sai de

Học ngu