x=5

đúng nha kagome

60-3(X-2)=51

=>3(X-2)=60-51

=>3(X-2)=9

=>X-2=9:3

=>X-2=3

=>X=3+2

=>X=5

60-3+.(x-2)=51

3+.(x-2)=60-51

3+.(x-2)=9

đề sai

\(60-3\left(x:2-2\right)=51\)

\(3\left(x:2-2\right)=60-51\)

\(3\left(x:2-2\right)=9\)

\(x:2-2=9:3\)

\(x:2-2=3\)

\(x:2=3+2\)

\(x:2=5\)

\(x=5.2\)

\(x=10\)

\(Vậy\) \(x=10\)

\(60 - 3 \left(\right. \frac{x}{2} - 2 \left.\right) = 51\)

\(- 3 \left(\right. \frac{x}{2} - 2 \left.\right) = 51 - 60\) \(- 3 \left(\right. \frac{x}{2} - 2 \left.\right) = - 9\)

\(\frac{x}{2} - 2 = 3\)

\(\frac{x}{2} = 5\)

\(x = 10\)\(\)

\(60-3\times(x - 2)=51\)

\(3\times(x-2)=60-51\)

\(3\times(x-2)=9\)

\(x-2=9:3\)

\(x-2=3\)

\(x=3+2\)

\(x=5\)

60-3(x-2)=51

3(x-2)=60-51=9

x-2=9:3=3

x=3+2

x=5

\(60-3\left(x-2\right)=51\)

=> \(3\left(x-2\right)=60-51=9\)

=> \(x-2=\dfrac{9}{3}=3\)

=> \(x=5\)

chúc em học tốt!

Đáp án cần chọn là: A

=>3.(x-2)=9

=> x-2=3

=>x=5

 study well

60-3.(x-2)=51

     3.(x-2)=60-51

     3.(x-2)=9

       x-2   =9:3

       x-2   =3

       x      =3+2

       x      =5

CHÚC HỌC TỐT NHA !!!!

3 x < x - 2>=60 - 51

3x <x -2>=9

       x - 2 = 9 : 3

      x -2    =  3

          x     = 3 + 2 

          x     = 5

Vậy x = 5