1170-(x-13) = 339 - 3x100

1170 - (x-13) = 339 - 300

1170-(x-13) = 39

x-13 = 1170-39

x-13 = 1131

x = 1131+13 =11 44

1170 : (x - 13) = 339 - 3 . 10²

1170 : (x -13) = 339 - 3 . 100

1170 : (x  -13) = 339 - 300

1170 : (x - 13) = 39

            x - 13 = 1170 : 39 

            x - 13 = 30

            x = 30 + 13

            x = 43

vậy x = 43

ủng hô mk nha

\(1170\div\left(x-13\right)=339-3.100\)

\(1170\div\left(x-13\right)=339-300\)

\(1170\div\left(x-13\right)=39\)

\(x-13=1170\div39\)

\(x-13=30\)

\(x=30+13\)

\(x=43\)

\(Vay\)\(x=43\)

a: =>1170:(x-13)=39

=>x-13=1170/39=30

=>x=43

b: \(\Leftrightarrow x^{1000}\cdot x^{999}-x=0\)

=>\(x\left(x^{1998}-1\right)=0\)

=>\(\left[{}\begin{matrix}x=0\\x^{1998}-1=0\end{matrix}\right.\Leftrightarrow x\in\left\{0;1;-1\right\}\)

\(3(x-9)+15=12+243:3^2\)

=> 3x - 27 + 15 = 12 + 243 : 9

=> 3x - 27 + 15 = 12 + 27

=> 3x - 27 + 15 = 39

=> 3x - 27 = 39 - 15

=> 3x - 27 = 24

=> 3x = 24 + 27

=> 3x = 51

=> x = 51 : 3 = 17

Vậy x = 17

\(1170:(x-13)=339-3\cdot10^2\)

=> 1170 : [x-13] = 339 - 3 . 100

=> 1170 : [x - 13] = 339 - 300

=> 1170 : [x-13] = 39

=> x - 13 = 30

=> x = 43

a) 3 ( x - 9 ) + 15 = 12 + 243 : 3²

3 ( x - 9 ) + 15 = 12 + 27

3 ( x - 9 ) + 15 = 39

3 ( x - 9 ) = 39 - 15

3 ( x - 9 ) = 24

x - 9 = 24 : 3

x - 9 = 8

x = 8 + 9

x = 17

Vậy x = 17

b) 1170 : ( x - 13 ) = 339 - 3 . 10²

1170 : ( x - 13 ) = 339 - 300

1170 : ( x - 13 ) = 39

x - 13 = 1170 : 39

x - 13 = 30

x = 30 + 13

x = 43

Vậy x = 43

=))

3.(x-9)+15=12+243:\(3^2\)

3.(x-9)+15=12+243:9

3.(x-9)+15=12+27

3.(x-9)+15=39

3.(x-9)=24

x-9=24:3

x-9=8

x=17

Vậy x=17

1170:(x-13)=339-3.\(10^2\)

1170:(x-13)=339-3.100

1170:(x-13)=339-300

1170:(x-13)=39

x-13=1170:39

x-13=30

x=30+13=43

Vậy x=43

\(x+2x+3x+4x=100\)

\(x\left(1+2+3+4\right)=100\)

\(x\times10=100\)

\(x=100\div10\)

\(x=10\)

x*(1+2+3+4) = 100

x*10 = 100

x = 10

x + 2*x + 3*x + 4*x = 100

x * ( 2 + 3 + 4 + 1) = 100

x * 10 = 100

x        = 100 : 10

x         = 10

a)=>3x=33

=>x=11

b)x²⁰⁰=x

=>x²⁰⁰-x=0

=>x(x¹⁹⁹-1)=0=>x=0 hoặc x=1

c)=>1170:(x-13)=339-300=39

=>x-13=1170:39=30

=>x=43

d)=>7x=28

=>x=4

Lời giải:
$2x^2-2^3.5=-2^3$

$2x^2=-2^3+2^3.5=2^3(5-1)=2^3.4=2^3.2^2=2.2^4$

$\Rightarrow x^2=2^4=4^2=(-4)^2$

$\Rightarrow x=4$ hoặc $x=-4$

(9x³ + 2.3³) : 14 = (13 - 8)² - 4²

(9x³ + 2.27) : 14 = 5² - 16

(9x³ + 54) : 14 = 25 - 16

(9x³ + 54) : 14 = 9

(9x³ + 54) = 9 x 14

(9x³ + 54) = 126

9x³ = 126 - 54

9x³ = 72

x³ = 72 : 9

x³ = 8

x³ = 2³

⇒ x = 2

@Hữu Nghĩa: e cảm ơn ạ!!!

3 * ( x - 9) + 15 = 12  + 243 : 9

3 * ( x - 9 ) + 15 = 39  

3 * ( x- 9 )         = 39 - 15 

3 * ( x - 9 )        = 24

       x - 9         = 24 : 3

       x - 9         = 8

        x             = 8 + 9

        x             = 17

Vậy...

^^ Cbht!!!   

3*(x-9)+15=12+243:9

3*(x-9)+15=12+27

3*(x-9)+15=39

3*(x-9)=39-15

3*(x-9)=24

x-9=24:3

x-9=8

x = 17

502-(x+5):2=318

(x+5):2=502-318

502-(x+5)=636

(x+5):2=184

(x+5)=184*2

(x+5)=368

x=363

120+[(999-9x):60]:24

3 * ( x - 9 ) + 15 = 12 + 243 : 9

3 * ( x - 9 ) + 15 = 12 + 27 = 39

        3 * ( x - 9 ) = 39 - 15 = 24

               x - 9    = 24 : 3 = 8

                       x  = 8 + 9

                       x  = 17 .

502 - ( x + 5 ) : 2 = 318

          ( x + 5 ) : 2 = 502 - 318 = 184

               x + 5      = 184 x 2 = 368

                          x = 368 - 5 

                           x = 363 .

120 + [ ( 999 - 9x ) : 60 ] : 24 = ?