a. x - (17 - 8) = 5 + (10 - 3x)

=> x - 9 = 5 + 10 - 3x

=> x + 3x = 15 + 9

=> 4x = 24

=> x = 6

b. 25 - (30 + x) = x - (27 - 8)

=> 25 - 30 - x = x - 19

=> -x -x = -19 + 30 - 25

=> -2x = -14

=> x = 7

c. (x - 12) - 15 = (20 - 7) - (18 + x)

=> x - 12 - 15 = 13 - 18 - x

=> x + x = 13 - 18 + 12 + 15

=> 2x = 22

=> x = 11

Cảm ơn nhé bạn Minh Hiền!

ko quan tam

a)x-13=-5+8

x-13=3

x=3+13

x=16 hoặc -10

b)|x-2|=|-5|

|x-2|=5|

|x|=5+2

|x|=7

x=7 hoặc -7

c)25-(30+x)=x-(27-8)

25-(30+x)=x-19

...còn lại mình bó tay

d)bó tay luôn

ko biet

25 - (30 + x) = x - (27 - 8)

25 - (30 + x) = x - 19

25 - 30 - x = x - 19

-5 - x = x - 19

-x - x = -19 + 5

-2x = -14

x = -14 : (-2)

x = 7

vậy____

25-(30+x)=x-(27-8)

=> 25-30-x=x-19

=>-5-x=x-19

=>-5+19=x+x

=>14=2x

=>x=7

25 -( 30 + x) = x - (27-8)

25 - 30 - x    = x - 19

     -x - x      = -19 -25+ 30

     - 2x        = - 44 + 30

     -2x         =  -14

        x        =   -14 : 2

        x        = -7.

^_^ k mình nha

a) x - (17 - 8) = 5 + (10 - 3x)

x - 17 + 8 = 5 + 10 - 3x

x + 3x = 5 + 10 + 17 - 8

4x = 24

x = 24 : 4

x = 6

b) 25 - (30 + x) = x - (27 - 8)

25 - 30 - x = x - 27 + 8

-x - x = -27 + 8 - 25 + 30

-2x = -14

x = (-14) : (-2)

x = 7

c) (x - 12) - 15 = (20 - 7) - (18 + x)

x - 12 - 15 = 20 - 7 -18 - x

x + x = 20 - 7 - 18 + 12 + 15

2x = 22

x = 22 : 2

x = 11

d) 9 - 25 = (7 - x) - (25 + 7)

9 - 25 = 7 - x - 25 - 7

x = 7 - 25 - 7 - 9 +25

x = -9

a, bổ sung đề 

 \(\dfrac{29-x}{21}+1+\dfrac{27-x}{23}+1+\dfrac{25-x}{25}+1+\dfrac{23-x}{27}+1+\dfrac{21-x}{29}+1=0\)

\(\Leftrightarrow\dfrac{50-x}{21}+\dfrac{50-x}{23}+\dfrac{50-x}{25}+\dfrac{50-x}{27}+\dfrac{50-x}{29}=0\)

\(\Leftrightarrow\left(50-x\right)\left(\dfrac{1}{21}+\dfrac{1}{23}+\dfrac{1}{25}+\dfrac{1}{27}+\dfrac{1}{29}\ne0\right)=0\Leftrightarrow x=50\)

Câu hỏi tương tự nha bạn!

a) x-(-25+x)=13-x

⇒ x+25-x=13-x

⇒ 13-x=25

⇒ x= -12

b) 15-(30+x)=x-(27-l-8l)

⇒ 15-30-x=x-(27-8)

⇒ -15-x=x-19

⇒ -x-x=-19+15

⇒ -2x+4=0

⇒ -2x=-4

⇒ x=2

c) (12x-4³).8³=4.8⁴

⇒ 12x.8³-4³.8³=4.8⁴

⇒ 6144x-32768=16384

⇒ 6144x=49152

⇒ x=8

a: Ta có: \(x-\left(-25+x\right)=13-x\)

\(\Leftrightarrow13-x=25\)

hay x=-12

b: Ta có: \(15-\left(30+x\right)=x-\left(27-\left|-8\right|\right)\)

\(\Leftrightarrow-15-x=x-19\)

\(\Leftrightarrow-2x=-4\)

hay x=2

c: Ta có: \(\left(12x-4^3\right)\cdot8^3=4\cdot8^4\)

\(\Leftrightarrow\left(12x-64\right)\cdot512=16384\)

\(\Leftrightarrow12x-64=32\)

hay x=8

x-(17-8)=5+(10-3x)

=>x-9 = 5+10-3x = 15-3x

=> x+3x = 15+9

=> 4x = 24

=> x = 24 : 4 = 6

25-(30+x)=x-(27-8)

=> 25-30-x=x-19

=> -5-x=x-19

=> x+x = -5+19 = 14

=> 2x=14

=> x=14:2 =7

k mk nha

1a) 25 .8 - 12.5 + 272 :17 - 8

= 200 -  60 + 16 - 8

= 140+16-8

= 156 - 8

= 148

b) 125: 25 +14 - 142 : 71

= 5 + 14 - 2 

= 19 - 2 = 17

c) 13. 17 - 256: 16 + 14 : 7 - 1

= 221 - 16 + 2 - 1 

= 205 + 2 - 1 

= 207 - 1 = 206

d) 15 . 24 - 14 . 5 (145 : 5 - 27)

= 360 - 70 (29- 27)

= 360 - 70 . 2

= 360 - 140

= 220

2a) 37 + x = 55

               x= 55 - 37

               x = 18

b) x- 31 = 24

     x       = 24 + 31

     x        = 55

c) 21 (x-11) = 21

        x - 11   = 21 : 21

          x        = 1 +11

           x       = 12

d ) 9. (x - 29)= 0

           x - 29 = 0 :9

             x       = 29

e) (x - 1954) . 5 = 50

         x - 1954   = 50 : 5

          x             = 1964

f ) 30 . 60 - x = 30

        1800 - x   = 30

             x        = 1800 - 30

             x        = 1770

Viết mỏi tay quá huhuh

Cảm ơn nghen

thanks bn nhé