Question

tìm x biết:15+3(5x-6)=72

 

Answer 1

15+3(5x-6)=72

15+15x-18=72

15x-3=72

15x=75

x=5

Answer 2

\(15+3(5x-6)=72\)

\(\implies 3(5x-6)=72-15\)

\(\implies 15x-18=57\)

\(\implies 15x=57+18\)

\(\implies15x=75\)

\(\implies x=5\)

Vậy x=5

_Học tốt_

Answer 3

3(5x-6)=72-15

    5x-6=57:3

    5x.  =19+6

      x.  =25:5

      x.  =5

Answer 4

15 + 3(5x + 6) = 72

3(5x + 6) = 72 - 15

3(5x + 6) = 57

5x + 6 = 57 : 3

5x + 6 = 19

5x = 19 - 6

x = 13

x = 13 : 5

x = 2, 6

Answer 5

15+3(5x-6)=72

3(5x-6)=72-15

3(5x-6)=57

5x-6=57:3

5x-6=19

5x=19+6

5x=25

x=25:5

x=5

Answer 6

15+3(5x-6)=72

      18(5x-6)=72

           5x-6=72:18

           5x-6=4

         5x      =4+6

      5x       =10

   X       =10:5

   X       =2

Answer 7

15 + 3 ( 5x - 6 ) = 72

        3 ( 5x - 6 ) = 72 - 15

        3 ( 5x -6 ) = 57

             5x - 6  = 57 : 3

             5x - 6 = 19

                    5x = 19 + 6

                     5x= 25

                     x = 25 : 5

                     x = 5

Answer 8

\(15+3\left(5x-6\right)=72\)

           \(3\left(5x-6\right)=72-15=57\)

              \(\rightarrow5x-6=57\div3\)

                   \(5x-6=19\)

                           \(5x=19+6=25\)

                              \(x=25\div5\)

                         \(\Rightarrow x=5\)

Answer 9

15+3(5x-6)=72

15+15x-18=72

15x-3=72

15x=75

x=5

Answer 10

15+3(5x-6)=72

15+15x-18=72

15x=72+18-15

15x=75

x=75/15=5

Vậy x=5