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

( 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

2(3x +2) -15=4x+9

6x+12-4x=9+15

6x - 4x=24-12

(6-4)x=12

2x=12

x=6

Vậy x=6

bik thế thoi ak

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

(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

dễ ẹt tik di lm cho that do 

a) Ta có: \(x^2-x-12=0\)

\(\Leftrightarrow\left(x-4\right)\left(x+3\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x=4\\x=-3\end{matrix}\right.\)

b) Ta có: \(x^2+3x-18=0\)

\(\Leftrightarrow\left(x+6\right)\left(x-3\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x=-6\\x=3\end{matrix}\right.\)

Tìm x:

\(a.\dfrac{35}{28}-x=\dfrac{5}{14}\\ x=\dfrac{35}{28}-\dfrac{5}{14}\\ x=\dfrac{25}{28}\\ b.\dfrac{6}{7}\times x=\dfrac{2}{3}\\ x=\dfrac{2}{3}:\dfrac{6}{7}\\ x=\dfrac{7}{9}\\ c.x\times7=\dfrac{3}{4}\\ x=\dfrac{3}{4}:7\\ x=\dfrac{3}{28}\\ d.2:x-\dfrac{1}{3}=\dfrac{2}{5}\\ 2:x=\dfrac{2}{5}+\dfrac{1}{3}\\ 2:x=\dfrac{11}{15}\\ x=2:\dfrac{11}{15}\\ x=\dfrac{30}{11}.\)

\(a,\dfrac{35}{28}-x=\dfrac{5}{14}\)

\(x=\dfrac{35}{28}-\dfrac{5}{14}\)

\(x=\dfrac{25}{28}\)

\(b,\dfrac{6}{7}\times x=\dfrac{2}{3}\)

\(x=\dfrac{2}{3}:\dfrac{6}{7}\)

\(x=\dfrac{7}{9}\)

\(c,x\times7=\dfrac{3}{4}\)

\(x=\dfrac{3}{4}:7\)

\(x=\dfrac{3}{28}\)

\(d,2:x-\dfrac{1}{3}=\dfrac{2}{5}\)

\(2:x=\dfrac{2}{5}+\dfrac{1}{3}\)

\(2:x=\dfrac{11}{15}\)

\(x=2:\dfrac{11}{15}\)

\(x=\dfrac{30}{11}\)

#YVA

a.\(\left(-12\right)x-14=-2\)

\(\left(-12\right)x=-2+14\)

\(\left(-12\right)x=12\)

\(x=12:\left(-12\right)\)

\(x=-1\)

\(b,\left(-8\right)x=\left(-5\right)\left(-7\right)-3\)

\(\left(-8\right)x=35-3\)

\(\left(-8\right)x=32\)

\(x=32:\left(-8\right)\)

\(x=-4\)

\(c,\left(-9\right)x+3=\left(-2\right)\left(-7\right)+16\)

\(\left(-9\right)x+3=14+16\)

\(\left(-9\right)x+3=30\)

\(\left(-9\right)x=30-3\)

\(\left(-9\right)x=27\)

\(x=27:\left(-9\right)\)

\(x=-3\)