ủa cái này hình như bn lạc lõn gì đấy trả lời r mà ?

\(\Leftrightarrow80\left(2x-9\right)=240\times39\)

\(\Leftrightarrow160x-720=9360\)

\(\Leftrightarrow160x=9360+720\)

\(\Leftrightarrow160x=10080\)

\(\Leftrightarrow x=63\)

MSC (mẫu số chung): 240

Quy đồng mẫu 2 vế và khử mẫu ta được:

2x - 9 = 117

     2x = 117 + 9 = 126

       x = 126 : 2 = 63

\(\dfrac{2x-9}{240}=\dfrac{39.3}{240}\Leftrightarrow2x-9=117\Leftrightarrow x=\dfrac{117+9}{2}=\dfrac{126}{2}=63\)

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

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

\(2x-9=117\)

\(2x=126\)

\(x=63\)

2x-9/240=39/80

hay 39.3/240=2x-9/240

nên 117=2x-9

      x=63

2x-9/240=39/80

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

=>2x-9=117

=>2x=117+9

=>2x=126

=>x=126:2

=>x=63

2x-9 / 240 = 39 / 80 

2x-9 / 240 = 117 / 240 

2x - 9 = 117 

2x = 117 + 9 

2x = 126 

x = 126 : 2 

x = 63 

Vậy x = 63 

\(\frac{2x-9}{240}=\frac{39}{80}\)

\(\Rightarrow\frac{2x-9}{240}=\frac{117}{240}\)

\(\Rightarrow2x-9=117\)

\(\Rightarrow2x=117+9\)

\(\Rightarrow2x=126\)

\(\Rightarrow x=126:2\)

\(\Rightarrow x=63\)

Vậy \(x=63\)

Chúc bạn học tốt !!!

2x - 9 / 240 = 39/ 80

=> ( 2x - 9 )  ,. 80 = 240 . 39
=> ( 2x - 9 ) . 80 = 9360

=> ( 2x - 9 ) = 9360 : 80

=> ( 2x - 9 ) = 117

=> 2x = 117 + 9

=> 2x = 126

=> x= 126 : 2

=> x = 63

Ta có: \(\frac{2x-9}{240}=\frac{39}{80}\)

=> \(\frac{2x-9}{240}=\frac{117}{240}\)

=> 2x-9 = 117

=> 2x = 117+9

=> 2x = 126

=> x = 126:2

=> x = 63

Ta có: \(\frac{2x-9}{240}=\frac{39}{80}\)

=> \(\frac{2x-9}{240}=\frac{156}{240}\)

=> 2x-9 = 156

=> 2x = 156+9

=> 2x = 165

=> x = 82,5

\(\dfrac{2x-9}{240}=\dfrac{117}{240}\)

=> 2x -9=117

2x=117+9

2x=126

x=126/2

x=63

\(\dfrac{2x-9}{240}\)=\(\dfrac{117}{240}\)

►2x-9=117

2x=117+9

2x=126

x=126:2

x=63

Vậy:x=63

\(\dfrac{2x-9}{240}=\dfrac{39}{80}=\dfrac{117}{240}\)

\(\Rightarrow2x-9=117\)

\(2x=117-9\)

\(2x=108\)

\(x=108:2\)

\(x=54\)

Vậy: \(x=54\)

Ta có:\(\frac{2x-9}{240}=\frac{39}{40}\Rightarrow\frac{2x-9}{240}=\frac{234}{240}\)

=>2x-9=234

=>2x=234+9

=>2x=243

=>x=243:2

=>x=121,5

Mà x là số nguyên nên không có x thỏa mãn

Ta có: \(\frac{2x-9}{240}=\frac{39}{80}=\frac{117}{240}\)

=>\(2x-9=117\)

\(2x=117+9=126\)

\(x=126:2=63\)

Ta có :\(\frac{39}{80}=\frac{117}{240}\)

nên \(\frac{2x-9}{240}=\frac{117}{240}\)

\(\Rightarrow2x-9=117\)

\(2x=117+9\)

\(2x=126\)

\(x=126:2\)

\(x=63\)

\(\dfrac{2x-9}{240}\)=\(\dfrac{39}{80}\)\(\Rightarrow\)\(2x-9\)=\(\dfrac{240.39}{80}\)=\(117\)

\(2x-9=117\)\(\Rightarrow\)\(2x=117+9=126\)\(\Rightarrow\)\(x=126:2=63\)

\(\dfrac{2x-9}{240}\)=\(\dfrac{39}{80}\) \(\Rightarrow\) \(2x-9=\)\(\dfrac{240.39}{80}\)=117

\(2x-9=117\)\(\Rightarrow\)\(2x=117-9=108\)\(\Rightarrow\)\(x=108:2=54\)