39/80=117/240

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

=>2x-9=117

=>2x=126

=>x=63

39/80 = 117/240

\(\Rightarrow\) 2x - 9/240 = 117/240

      2x            = 117/240 + 9/240

      2x            = 21/40

        x            = 21/40 : 2

        x            =   21/80

Đáp án là 63. Cách giải giống bạn Huy.

2x-9/240=39/80

(2x-9).80=39.240

160x-720=9360

160x=10080

x=63

39/80=117/240

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

=>2x-9=177

=>2x=126

=>x=63

nó phải có = bao nhiêu thì mới ra kết quả bạn ạ 

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

\(2x\) \(-\) \(9\) \(=\) ( \(240\) \(.\) \(39\) ) \(:\) \(80\)

\(2x\) \(-\) \(9\) \(=\) \(117\)

\(2x\) \(=\) \(126\)

\(x\) \(=\) \(63\) 

$x$ $=$ $63$ 

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

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

\(2x-9=117\)

\(2x=126\)

\(x=63\)

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

\(2x=\frac{39}{80}+\frac{9}{240}=\frac{21}{40}\)

\(x=\frac{21}{40}\div2=\frac{21}{40}\times\frac{1}{2}=\frac{21}{80}\)

không có nghiệm

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

=> 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: \(x=54\)

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

<=> \(\left(2x-9\right)\cdot80=240\cdot39\)

<=> \(160x-720=9360\)

<=> \(160x=10080\)

<=> \(x=63\)

\(\left|x-8\right|+12=25\)

<=> \(\left|x-8\right|=13\)

<=> x - 8 = 13 hoặc x - 8 = -13

<=> x = 21 hoặc x = -5

(2x-9):3/240:3 =39/80

2x:3-3/80=39/80

=>2x:3 =39

    2x    = 39:3

    2x =13 

    x = 13 :2 

    x = 13/2

b)x - 8 =25 -12

   x - 8 = 13

   x      =  13 +8  

   x      = 21

ok rồi đó :))