Câu hỏi tương tự nha !!!!!

45 - 3 x (x+2) = 8 x 3 = 24

3 x (x+2) = 45 - 24 = 21

x+2 = 21 : 3 = 7

x = 7-2 = 5

k mk nha

3 x (x+2) = 45 - 24 = 21
x+2 = 21 : 3 = 7
x = 7-2 = 5

chúc bn hok tốt @_@

=> 45 -3 x ( x+2)=24

3 x ( x+2) =21

x+2 =7

=> x=5

3*2^x-3=45

3*2^x=45+3=48

2^x=48:3=16

2^x=2^4

=> x=4

Vậy x=4

3.2^x-3=45

\(\Rightarrow\)3.2^x=45+3

\(\Rightarrow\)3.2^x=48

\(\Rightarrow\)2^x=48:3

\(\Rightarrow\)2^x=16

\(\Rightarrow\)2^x=2⁴

\(\Rightarrow\)x=4

3.2^x-3=45

3.2^x   =45+3

3.2^x   =48

2^x      =48:3

2^x      =16

suy ra 2^x=2^4

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

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

<=>-3-2x=-1/3

<=> 2x = -8/3

<=> x = -4/3

Vậy ...

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

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

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

<=> -3 - 2 . x = -1/3

<=> 2x = -3 - ( -1/3 )

<=> 2x = -8/3

<=> x = -4/3

\(\text{-45: 5. ( -3-2.x)=3}\)

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

\(< =>-3-2x=\frac{1}{3}\)

\(< =>2x=-\frac{8}{3}\)

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

Vậy x=\(-\frac{4}{3}\)

chúc bạn học tốt !

\(a,12\left(x-1\right)=0\\ x-1=0\\ x=1\\ b,45+5\left(x-3\right)=70\\ 5\left(x-3\right)=25\\ x-3=5\\ x=8\\ c,3.x-18:2=12\\ 3.x-9=12\\ 3.x=21\\ x=7\)

12(x-1)=0

     (x-1)=0:12

      x-1=0

      x=0+1

      x= 1

Vậy x= 1

12 ( x - 1 ) = 0
       x - 1   = 0 : 12
       x - 1   = 0
=>   x        = 1

45- / x+2 / = 27

   / x+2 /   = 45-27

   / x+2 /   =  18

Suy ra          x+2 = 18      hoặc     x+2 = -18

Suy ra          x    =16                    x   =   -20

 Vậy     x    =16     hoặc       x   =   -20

\(5x+\left(1+2+3+4\right)=45\)

\(5x+10=45\)

\(5x=35\)

\(x=7\)

Vậy \(x=7\)

\(x+\left(x+1\right)+\left(x+2\right)+\left(x+3\right)+\left(x+4\right)=45\)

\(\Leftrightarrow5x+\left(1+2+3+4\right)=45\)

\(\Leftrightarrow5x+10=450\Rightarrow5x=440\Rightarrow x=88.\)

\(5x+10=45\)

\(5x=35\)

\(x=7\)

x=25 nha bạn

( x + 3 ) + ( x + 5 ) + ( x + 7 ) = 45 x 2

x x 3 + ( 3 + 5 + 7 )               = 90

x x 3 +      15                        = 90

x x 3                                     = 90 - 15

x x 3                                     = 75

                                         x = 75 : 3

                                         x = 25