(x+3).(2x-18)=0

=>x+3=0 hoặc 2x-18 =0

+)x+3=0

x=-3

+)2x-18=0

2x =18

x =9

Vậy x \(\in\)\(_{\left\{-3;9\right\}}\)

2x+35=x-27

2x-x =-35-27

x = -62

\(a.2x+35=x-27\)

\(\Leftrightarrow2x-x=-27-35\)

\(\Rightarrow x=-62\). Vậy \(x=-62\)

\(b.2x-41=3x+\left(-23\right)\)

\(\Leftrightarrow2x-3x=-23+41\)

\(\Leftrightarrow-x=18\)

\(\Rightarrow x=-18\). Vậy \(x=-18\)

\(c.4\left(x-3\right)-3\left(x+5\right)=45.\left(-2\right)-34\)

\(\Leftrightarrow4x-12-3x-15=-124\)

\(\Leftrightarrow4x-3x=-124+12+15\)

\(\Rightarrow x=-97\). Vậy \(x=-97\)

\(d.\left(x+3\right)\left(2x-18\right)=0\)

\(\Leftrightarrow\hept{\begin{cases}x+3=0\\2x-18=0\end{cases}\Rightarrow\hept{\begin{cases}x=-3\\x=9\end{cases}}}\). Vậy \(x=-3;9\)

\(a,x-36:18=12-15\\ \Rightarrow x-2=-3\\ \Rightarrow x=-1\\ b,92-\left(17+x\right)=72\\ \Rightarrow17+x=20\\ \Rightarrow x=3\\ c,720:\left[41-\left(2x+5\right)\right]=40\\ \Rightarrow41-\left(2x+5\right)=18\\ \Rightarrow2x+5=23\\ \Rightarrow2x=18\\ \Rightarrow x=9\\ d,\left(x+2\right)^3-23=41\\ \Rightarrow\left(x+2\right)^3=64\\ \Rightarrow\left(x+2\right)^3=4^3\\ \Rightarrow x+2=4\\ \Rightarrow x=2\)

b: =>x+17=20

hay x=3

d: =>x+2=4

hay x=2

a, 2x + 35 -x+27=0

   x +62=0

x=-62

b, 2x -41 -3x + 23 =0

-x -18=0

-x=18

x=-18

c, 4x -12-3x-15= -124

x -27=-124

x= -97

d, Suy ra x+3 =0 hoặc 2x-18=0

               x=-3   hoặc  2x=18 => x=9

vậy x=-3 hoặc x=9

a. x + 3x = 360

<=> 4x = 360

<=> x = 90

b. 41 - (2x - 5) = 18

<=> 41 - 2x + 5 = 18

<=> 2x = -(18 - 5 - 41)

<=> 2x = 28

<=> x = 14

c. 2^x . 4 = 128

<=> 2^{x + 2} = 2⁷

<=> x + 2 = 7

<=> x = 5

a, \(\Leftrightarrow4x=360\\ \Leftrightarrow x=90\)

b, \(\Leftrightarrow2x-5=23\\ \Leftrightarrow2x=28\\ \Leftrightarrow x=14\)

c, \(\Leftrightarrow2^{x+2}=2^7\\ \Leftrightarrow x+2=7\\ \Leftrightarrow x=5\)

đùa nhau à

?

Tìm số nguyên x, biết:
1) -16 + 23 + x = - 16

7+x=-16

    x=-16-7

    x=-23
2) 2x – 35 = 15

2x=15+35

2x=50

  x=50:2

  x=25
3) 3x + 17 = 12

3x=12-17

3x=-5

  x=-5/3
4) (2x – 5) + 17 = 6

2x-5=6-17

2x-5=-11

2x=-11+5

2x=-6

  x=-6:2

  x=-3
5) 10 – 2(4 – 3x) = -4

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

2(4-3x)=14

4-3x=14:2

4-3x=7

3x=4-7

3x=-3

  x=-3:3

  x=-1
6) - 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

tự đi mà làm