Question

Tìm số nguyên x biết rằng:2x-9 / 240=39/80

Answer 1

\(\frac{2x-9}{240}=\frac{39}{80}\Leftrightarrow\left(2x-9\right).80=240.39\)

\(2x-9=\left(240.39\right):80\)

\(2x-9=117\)

\(2x=126\)

\(x=63\)

Answer 2

2x-9/240=39/80

hay 39.3/240=2x-9/240

nên 117=2x-9

      x=63

Answer 3

2x-9/240=39/80

=>2x-9/240=117/240

=>2x-9=117

=>2x=117+9

=>2x=126

=>x=126:2

=>x=63

Answer 4

            2x-9 / 240 =39 / 80                                      

          (2x-9)x80    =240x39

            160x -70    =9360

            160x           =9360+720

             160x          =10080

                   x          =10080 : 160

                   x          =63

Answer 5

Ta có 2x-9/240 = 39/80

=>2x-9/240 = 117/240

=>2x-9 = 117 =>2x = 126

                    =>x = 63