=>12x-33=3^5

=>12x=276

=>x=23

12x-33=9.27

12x-33=243

12x=243+33

12x=276

x=276:12

x=23

Bài 15:

a: 2x+x=45

=>3x=45

=>\(x=\frac{45}{3}=15\)

b: 2x+7x=918

=>\(x\cdot\left(7+2\right)=918\)

=>9x=918

=>\(x=\frac{918}{9}=102\)

c: 2x+3x=60+5

=>5x=65

=>\(x=\frac{65}{5}=13\)

d: \(11x+22x=33\cdot2\)

=>33x=66

=>\(x=\frac{66}{33}=2\)

Bài 14:

a: (12-x)(2-x)=0

=>\(\left[\begin{array}{l}12-x=0\\ 2-x=0\end{array}\right.\Rightarrow\left[\begin{array}{l}x=12\\ x=2\end{array}\right.\)

b: (x-33)(11-x)=0

=>\(\left[\begin{array}{l}x-33=0\\ 11-x=0\end{array}\right.\Rightarrow\left[\begin{array}{l}x=33\\ x=11\end{array}\right.\)

c: (21-x)(12-x)=0

=>\(\left[\begin{array}{l}21-x=0\\ 12-x=0\end{array}\right.\Rightarrow\left[\begin{array}{l}x=21\\ x=12\end{array}\right.\)

d: (50-x)(x-150)=0

=>\(\left[\begin{array}{l}50-x=0\\ x-150=0\end{array}\right.\Rightarrow\left[\begin{array}{l}x=50\\ x=150\end{array}\right.\)

Bài 13:

a: (x-2)(x-3)=0

=>\(\left[\begin{array}{l}x-2=0\\ x-3=0\end{array}\right.\Rightarrow\left[\begin{array}{l}x=2\\ x=3\end{array}\right.\)

b: (x-3)(x-4)=0

=>\(\left[\begin{array}{l}x-3=0\\ x-4=0\end{array}\right.\Rightarrow\left[\begin{array}{l}x=3\\ x=4\end{array}\right.\)

c: (x-7)(6-x)=0

=>\(\left[\begin{array}{l}x-7=0\\ 6-x=0\end{array}\right.\Rightarrow\left[\begin{array}{l}x=7\\ x=6\end{array}\right.\)

d: (x-3)(x-13)=0

=>\(\left[\begin{array}{l}x-3=0\\ x-13=0\end{array}\right.\Rightarrow\left[\begin{array}{l}x=3\\ x=13\end{array}\right.\)

(x-35)-120=0

x-35=120

x=155

156-(x+61)=82

      -(x+61)=-74

        x+61=74

        x=13

12x-33=3^2.3^3

12x-33=243

12x=276

x=23

e: =>-40+3+33+40-x=47

=>36-x=47

=>x=-11

f: =>x(x-3)(11-x)(11+x)=0

hay \(x\in\left\{0;3;11;-11\right\}\)

g: =>-62-38-x+2x=-100

=>x-100=-100

hay x=0

i: =>x-12-2x-31=6

=>-x-43=6

=>x+43=-6

hay x=-49

h: =>(x+1)=0

=>x=-1

f: =>x(x-3)(x+11)(x-11)=0

hay \(x\in\left\{0;3;-11;11\right\}\)

56 - 3 ( x + 1) = 42

       3( x +1)     = 56 - 42 

       3( x + 1)    = 14

            x + 1      = 14/3

           x               = 14/3 - 1

           x                = 11/3

2/  12.x - 33  = 9.27

       12.x - 33  = 243

        12x          = 243 + 33

        12x           = 276 

          x              = 276 : 12

         x                = 23

56 - 3 ( x + 1) = 42

       3( x +1)     = 56 - 42 

       3( x + 1)    = 14

            x + 1      = 14/3

           x               = 14/3 - 1

           x                = 11/3

2/  12.x - 33  = 9.27

       12.x - 33  = 243

        12x          = 243 + 33

        12x           = 276 

          x              = 276 : 12

         x                = 23

Tick đúng nha

\(a,5.\left(x+35\right)=515\)

\(x+35=103\)

\(x=103-35\)

\(x=68\)

\(b,12.x-33=3^2.3^3\)

\(12x-33=243\)

\(12x=276\)

\(x=23\)

\(d,12.\left(x-1\right):3=4^3-2^3\)

\(12.\left(x-1\right):3=56\)

\(12.\left(x-1\right)=168\)

\(x-1=14\)

\(x=15\)

a: 7x+58=100

nên 7x=42

hay x=6

c: x-56:x=16

nên x-14=16

hay x=30

c)x - 56 : 4  = 16

x - 56       = 16 : 4 

x- 56        = 4

x               =4 + 56

x               = 60 

d)101 + (36 - 4x) = 105 

          (36- 4x ) = 105 - 101 

          36 - 4x = 4

                4x = 36 - 4 

                4x = 32

                  x = 32:4

                  x = 8