4.x=16

-37 + 14 +26 + 37 

=-37 + 37 + 14 + 36 

=0 + 50

=50

  -24 + 6 + 10 + 24 

=(-24 + 24) +(6+10)

= 0+16

= 16

Bài 1: Tìm \(x\) 

a; \(x-2\) + 7 = 1.3.(-9)

   \(x\) - 2 + 7 = 3.(-9)

   \(x\) - 2 + 7 = - 27

  \(x\)             = - 27 - 7 + 2

   \(x\)            = - 34 + 2

   \(x\)            = - 32

Vậy \(x=-32\)

Bài 1

c; - 2\(x\) + 5 = 7

     - 2\(x\)       = 7  - 5

    - 2\(x\)        = - 2

        \(x\)        = -2 : (-2)

        \(x\)        = - 1

Vậy \(x\)         = - 1

A,-16+23+x=-16

<=>x=-16+16-23

<=>x=-23

B,10-2(4-3x)=-4

<=>10-8+6x=-4

<=>6x=-4-10+8

<=>6x=-6

<=>x=-1

C,-12+3(-x+7)=-18

<=>-12-3x+21=-18

<=>-3x=-18+12-21

<=>-3x=-27

<=>x=9

D,24:(3x-2)=-3

<=>24/(3x-2)=-3

<=>-3(3x-2)=24

<=>3x-2=-8

<=>3x=-6

<=>x=-2

E,|x+8|-7=8

<=>|x+8|=15

<=>x+8=+-15

Chia 2 TH:

TH1:x+8=15

<=>x=7

TH2:x+8=-15

<=>x=-23

F,-45:5(-3-2x)=3

<=>-9(-3-2x)=3

<=>27+18x=3

<=>18x=-24

<=>x=-4/3

G,|x-1|=0

<=>x-1=0

<=>x=1

H,-13|x|=-26

<=>|x|=2

<=>x=+-2

a) -16 + 23 + x = -16

x = -16 + 16 - 23

x = -23

Vậy x = -23

b) 10 - 2. (4 - 3x) = -4

10 - 2 . 4 + 2. 3x = -4

10 - 8 + 6x = -4

6x = -4 - 10 + 8

6x = -6

x = (-6) : 6

x = -1

Vậy x = -1

c) -12 + 3. (-x + 7) = -18

-12 + 3. (-x) + 3. 7 = -18

-12 + (-3x) + 21 = -18

-3x = -18 + 12 - 21

-3x = -27

x = (-27) : (-3)

x = -9

Vậy x = -9

d) 24 : (3x - 2) = -3

3x - 2 = 24 : (-3)

3x - 2 = -8

3x = -8 + 2

3x = -6

x = (-6) : 3

x = -2

Vậy x = -2

e) lx + 8l - 7 = 8

lx + 8l = 8 + 7

lx + 8l = 15

\(\Rightarrow\hept{\begin{cases}x+8=15\\x=18-5\\x=13\end{cases}hay\hept{\begin{cases}x+8=-15\\x=-15-8\\x=-23\end{cases}}}\)

Vậy \(x\in\left\{13;-23\right\}\)

f) (-45) : 5. (-3 - 2x) = 3

(-9). (-3 - 2x) = 3

(-9). (-3) + 9. 2x = 3

27 + 18x = 3

18x = 3 - 27

18x = -24

x = (-24) : 18

x =\(\frac{-4}{3}\)

Vậy x =\(\frac{-4}{3}\)

g) lx - 1l = 0

\(\Rightarrow x-1=0\)

x = 0 + 1

x = 1

Vậy x = 1

h) (-13). lxl = -26

lxl = (-26) : (-13)

lxl = 2

\(\Rightarrow x=2\)

Vậy x = 2

Chúc bạn học tốt!!!

Bài 1 Tìm x biết:

a)65-(29-x)=32

65 -29+x=31

x=31-65+29

x=-5

b)(x+5)-(x+23)=x-34

x+5 -x +23 = x-34

(x-x)+ (23+5)=x-34

0+28=x-34

28=x-34

28+34=x

62=x

=>x=62

c)(16-x)+(x-38)=x+44

16-x+x-38=x+44

-x+x-x=44-16+38

-x=36

=>x=-36

d)-12+3(-x+7)=-18

3(-x+7)=-18+12

3(-x+7)=-6

-x+7=-6:3

-x+7=-2

-x=-2-7

-x=-9

=>x=9

Baif 2

d)|7-x|=10

=> \(\left[{}\begin{matrix}7-x=10\\7-x=-10\end{matrix}\right.\)

\(\Rightarrow\)\(\left[{}\begin{matrix}x=7-10\\x=-10-7\end{matrix}\right.\)

\(\Rightarrow\)\(\left[{}\begin{matrix}x=-3\\x=-17\end{matrix}\right.\)

e)(x-6).(7-2x)=0

\(\Rightarrow\)\(\left[{}\begin{matrix}x-6=0\\7-2x=0\end{matrix}\right.\)

\(\Rightarrow\)\(\left[{}\begin{matrix}x=0+6\\2x=7\end{matrix}\right.\)

\(\Rightarrow\)\(\left[{}\begin{matrix}x=6\\x=7:2\end{matrix}\right.\)

\(\Rightarrow\)\(\left[{}\begin{matrix}x=6\\x=3,5\end{matrix}\right.\)

f)(9-x).(2x+8)=0

\(\Rightarrow\)\(\left[{}\begin{matrix}9-x=0\\2x+8=0\end{matrix}\right.\)

\(\Rightarrow\)\(\left[{}\begin{matrix}x=0+9\\2x=-8\end{matrix}\right.\)

\(\Rightarrow\)\(\left[{}\begin{matrix}x=9\\x=-4\end{matrix}\right.\)

g)x(-x+8).(-3x-18)=0

\(\Rightarrow\) \(\left[{}\begin{matrix}x=0\\-x+8=0\\-3x-18=0\end{matrix}\right.\)

\(\Rightarrow\)\(\left[{}\begin{matrix}x=0\\-x=0+8\\-3x=0+18\end{matrix}\right.\)

\(\Rightarrow\)\(\left[{}\begin{matrix}x=0\\-x=8\\-3x=18\end{matrix}\right.\)

\(\Rightarrow\)\(\left[{}\begin{matrix}x=0\\x=-8\\x=18:\left(-3\right)\end{matrix}\right.\)

\(\Rightarrow\)\(\left[{}\begin{matrix}x=0\\x=-8\\x=-6\end{matrix}\right.\)

h)(-x+8).(x-54).(-24-x)=0

\(\Rightarrow\)\(\left[{}\begin{matrix}-x+8=0\\x-54=0\\-24-x=0\end{matrix}\right.\)

\(\Rightarrow\)\(\left[{}\begin{matrix}-x=8\\x=0+54\\-x=0+24\end{matrix}\right.\)

\(\Rightarrow\)\(\left[{}\begin{matrix}x=8\\x=54\\-x=24\end{matrix}\right.\)

\(\Rightarrow\)\(\left[{}\begin{matrix}x=8\\x=54\\x=-24\end{matrix}\right.\)

Câu 1:

a; x/7 = - 9/14

x = - 9/14 x 7

x = - 9/2

Vậy x = -9/2

b; - 16/36 = - y/4

-4/9 = - y/4

y = -4/9 x (-4)

y = 16/9

Vậy y = 16/9

Câu 1c:

-5/12 = x/60

x = -5/12 x 60

x = - 25

Vậy x = - 25

d: -4/8 = x/-10 = -7/y

-4/8 = x/-10

x = -4/8 x (-10)

x = 5

-4/8 = -7/y

y = - 7 : (-4/8)

y = 7 x 8/4

y = 14

Vậy (x; y) = (5; 14)

mai nah

cậu giúp mk là đc