a.\(7:\left|x-3\right|=4\)

\(\Leftrightarrow\left|x-3\right|=\frac{7}{4}\Leftrightarrow\orbr{\begin{cases}x-3=\frac{7}{4}\\x-3=\frac{-7}{4}\end{cases}\Leftrightarrow\orbr{\begin{cases}x=\frac{7}{4}+3\\x=\frac{-7}{4}+3\end{cases}}}\Leftrightarrow\orbr{\begin{cases}x=\frac{19}{4}\\x=\frac{5}{4}\end{cases}}\)

Vậy x = 19/4 hoặc x = 5/4

b. \(12:\left(x-8\right)=114\)

                 \(x-8=\frac{12}{114}=\frac{2}{19}\)

                 \(x=\frac{2}{19}+8\)

                 \(x=\frac{154}{19}\)

c. \(47+\left|x-7\right|=123\)

\(\Leftrightarrow\left|x-7\right|=123-47\Leftrightarrow\left|x-7\right|=76\)

\(\Leftrightarrow\orbr{\begin{cases}x-7=76\\x-7=-76\end{cases}\Leftrightarrow\orbr{\begin{cases}x=83\\x=-69\end{cases}}}\)

Vậy x = 83 hoặc x = -69

d.\(188+\left|3x-1\right|=1198\)

\(\Leftrightarrow\left|3x-1\right|=1198-188\Leftrightarrow\left|3x-1\right|=1010\)

\(\Leftrightarrow\orbr{\begin{cases}3x-1=1010\\3x-1=-1010\end{cases}\Leftrightarrow\orbr{\begin{cases}3x=1010+1\\3x=-1010+1\end{cases}\Leftrightarrow}\orbr{\begin{cases}3x=1011\\3x=-1009\end{cases}}}\Leftrightarrow\orbr{\begin{cases}x=337\\x=\frac{-1009}{3}\end{cases}}\)

Vậy x = 337 hoặc x= -1009/3

e. \(\left|4-x\right|+3=12\)

\(\Leftrightarrow\left|4-x\right|=12-3\Leftrightarrow\left|4-x\right|=9\)

\(\Leftrightarrow\orbr{\begin{cases}4-x=9\\4-x=-9\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=4-9\\x=-4-9\end{cases}\Leftrightarrow\orbr{\begin{cases}x=-5\\x=-13\end{cases}}}\)

Vậy x = -5 hoặc x = -13

g. \(\left|12x\right|-9=-41\)

\(\Leftrightarrow\left|12x\right|=-41+9\Leftrightarrow\left|12x\right|=-32\)\(\text{(Vô Lí)}\)

Vậy không tồn tại x  

\(x-\frac{3}{5}=\frac{4}{7}\)                             \(x+\frac{3}{5}=\frac{4}{3}\)                          \(-x-\frac{2}{7}=-\frac{8}{9}\)

\(x=\frac{4}{7}+\frac{3}{5}\)                           \(x=\frac{4}{3}-\frac{3}{5}\)                              \(-x=-\frac{8}{9}+\frac{2}{7}\)

\(x=\frac{41}{35}\)                                        \(x=\frac{11}{15}\)                                      \(-x=-\frac{38}{63}\)

                                                                                                                      \(x=\frac{38}{63}\)

\(\frac{7}{9}-x=\frac{1}{5}\)

\(x=\frac{7}{9}-\frac{1}{5}\)

\(x=\frac{26}{45}\)

giúp mik zứi😭😭😭

5/6 - 7/4 .|-2x - 3/2| = 7/12

7/4 .|-2x - 3/2| = 5/6 - 7/12

7/4.|-2x - 3/2| = 1/4

|-2x- 3/2| = 1/4 : 7/4

|-2x - 3/2| = 1/7

\(\Rightarrow\orbr{\begin{cases}-2x-\frac{3}{2}=\frac{1}{7}\\-2x-\frac{3}{2}=-\frac{1}{7}\end{cases}}\Rightarrow\orbr{\begin{cases}-2x=\frac{23}{14}\\-2x=\frac{19}{14}\end{cases}}\Rightarrow\orbr{\begin{cases}x=-\frac{23}{28}\\x=-\frac{19}{28}\end{cases}}\)

1+1=2

2+2=4

3+3=6

4+4=8

5+5=10

6+6=12

7+7=14

8+8=16

9+9=18

10+10=20

hok tốt .

1+1=2

2+2=4

3+3=6

4+4=8

5+5=8

6+6=12

7+7=14

8+8=16

9+9=18

10+10=20

CHÚC BẠN HOK TỐT NHA!

2

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12

14

16

18

20

`123-x=38`

`=> x= 123-38`

`=>x=85`

Vậy `x=85`

__

`(x+15) -7=33`

`=>x+15=33+7`

`=>x+16= 40`

`=>x=40-16`

`=>x=24`

Vậy `x=24`

__

`3^(x+3) -13=230`

`=> 3^(x+3) = 230+13`

`=>3^(x+3)=243`

`=> 3^(x+3)=3^5`

`=> x+3=5`

`=>x=5-3`

`=>x=2`

Vậy `x=2`