( 4600 + 6400 ) - 7x = 3839

 11000 - 7 . x = 3839

              7 . x = 11000 - 3839

              7 . x = 7161

                   x  = 7161 : 7

                   x   = 1023

Vậy x = 1023

x = 1023 nhé câu này mình lm rồi

a) (4600 + 6400) -7.x=3839

      11000  - 7.x=3839

                    7.x=11000-3839

                   7.x=7161

                      x=7161:7

                      x=1023

b) (8x-14) :2-2= 341:31

   (8x-14):2-2=11

(8x-14):2= 11+2

(8x-14):2=13

8x-14=13.2

8x-14=26

8x=26+14

8x=40

x=40:8

x=5

a) x=1023

b)x=5

c)x=38

a) \(\left(4600+6400\right)-7x=3839\Rightarrow11000-7x=3839\)
                                                             \(\Rightarrow-7x=3839-11000\)
                                                              \(\Rightarrow7x=7161\Rightarrow x=1023\)

a)(4600 + 6400) - 7.x = 3839

11000-7x=3839

7x=7161

x=1023

Vậy x=1023

b)[(8x - 14 ) : 2 - 2 ]. 31 = 341

(8x - 14 ) : 2 - 2=11

(8x - 14 ) : 2=13

8x - 14 =26

8x=40

x=5

Vậy x=5

c)2.(x - 3) - x = 4.2^3

2.(x - 3) - x=32

2x-6-x=32

x-6=32

x=38

Vậy x=38

Bài 1 : Tìm x

a, ( 4600 + 6400 ) - 7.x = 3839

11000 - 7.x = 3839

7.x = 11000 - 3839

7.x = 7161

x = 7161: 7

x = 1023

b, [ ( 8x - 14 ) : 2 - 2 ] . 31 = 341

( 8x -14 ) : 2 -2 = 11

( 8x -14 ) : 2 = 13

8x -14 = 26

8x = 40

x = 5

c, 2. ( x -3 ) - x = 4. 2³

2x - 6 - x = 32

x - 6 = 32

x = 38

a)1023

b)5

c)38

a) 219 - 7(y + 1) = 100

=> 7(y + 1) = 119

=> y + 1 = 19

=> y = 18

vậy_

a) 219 - 7(y+1) = 100

7(y+1) = 119

y+1 = 17

y = 16

các bài cn lại lm tương tự nha!

a, 219-7(y+1)=100

7(y+1)=219-100

7(y+1)=119

y+1=119:7

y+1=17

y=17-1

y=16

\(\left(6400+4600\right)-7y=3839\)

\(11000-7y=3839\)

\(7y=11000-3839\)

\(7y=7161\)

\(y=7161:7\)

\(y=1023\)

Vậy \(y=1023\)

Tham khảo nhé~

( 6400 + 4600 ) - 7y = 3839

=> 110000 - 7y = 3839

=> 7y = 110000 - 3839

=> 7y = 7161

=> y = 7161 : 7

=> y = 1023

Vậy y = 1023

Học tốt #

(6400+4600)-7y=3839

7y                   = (6400+4600)-3839

7y                   = 11000 -3839

7y                   =      7161

 y                    =       7161:7

 y                    =       1023

học tốt nhoa!!!

Tổng là:

6400+4600=11000

Đáp số : 11000

6400+4600=11000

6400+ 4600 = 110000

a/ 440 + 2 [ 125 - x ] = 546 

==> 2 [ 125 - x ] = 546 - 440 

==> 2 [ 125 - x ] 106 

==> 125 - x = 106 : 2 

==> 125 - x = 53  ==> x = 125 - 53 =72 

b/ 7x - 3³ = 2⁷ : 2⁴ 

==> 7x - 27 = 2^7-4 = 2³ = 8 

==> 7x = 8+ 27 

==> 7x = 35  ==> x = 35 : 7 = 5

c/  [ 12x - 4³ ] . 8³ = 4 . 8⁴ 

==> [ 12x - 2⁶ ] . 2⁹ = 2² . 2¹² 

==> [ 12x - 2⁶ ] . 2⁹ = 2¹⁴ 

==> [ 12x - 2⁶ ] = 2¹⁴ : 2⁹ = 2⁵ 

==>. 12x = 2⁵ + 2⁶ = 96 

==> x = 96 : 12 = 8

d/ 123 - 5. [ x + 4 ] = 38 

==> 5. [ x + 4 ] = 123 - 38 

==> 5. [ x + 4 ] = 85 

==> x + 4 = 85 : 5

==> x + 4 = 17 

==> x = 17 - 4 = 13 

e/ [ 2600 + 6400 ] - 3.x = 1200

==> 9000 - 3x = 1200

==> 3x = 9000 -1200 = 7800 

==> x = 7800 : 3 = 2600

f/ x² - 72 : 36 = 23 

==> x² - 2 = 23 

==> x² = 23 + 2 

==>x² = 25 

==> x² = 5² 

==> x = 5 

1: Ta có: 7x+6(3-x)=27-20+73

\(\Leftrightarrow7x+18-6x=80\)

\(\Leftrightarrow x=80-18=62\)

Vậy: x=62

2: Ta có: \(6x-5\left(x-7\right)=\left(27-514\right)-486-73\)

\(\Leftrightarrow6x-5x+35=27-514-486-73\)

\(\Leftrightarrow x+35=-1046\)

\(\Leftrightarrow x=-1081\)

Vậy: x=-1081

`a,4x-10=0   `

`<=> 4x=10`

`<=>x=10/4`

`<=>x=5/2`

`b, 7-3x=9-x     `

`<=>-3x+x=9-7`

`<=>-2x=2`

`<=>x=-1`

`c, 2x-(3-5x) = 4(x+3)`

`<=>2x-3+5x=4x+12`

`<=>2x+5x-4x=12+3`

`<=>3x=15`

`<=>x=5`

`d, 5-(6-x)=4(3-2x)     `

`<=>5-6+x=12-8x`

`<=>x+8x=12-5+6`

`<=>9x=13`

`<=>x=13/9`

`e, 4(x+3)=-7x+17   `

`<=>4x+12=-7x+17`

`<=>4x+7x=17-12`

`<=>11x=5`

`<=>x=5/11`   

`f, 5(x-3) - 4=2(x-1)+7`

`<=>5x-15-4=2x-2+7`

`<=>5x-2x=15+4-2+7`

`<=>3x=24`

`<=>x=8`

`g, 5(x-3)-4=2(x-1)+7       `

`<=>5x-15-4=2x-2+7`

`<=>5x-2x=15+4-2+7`

`<=>3x=24`

`<=>x=8`

`h,4(3x-2)-3(x-4)=7x+20`

`<=>12x-8-3x+12=7x+20`

`<=>12x-3x-7x=20+8+12`

`<=>2x=40`

`<=>x=20`