Question

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

Answer 1

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 

Answer 2

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

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

\(\Rightarrow2x-9=117\)

\(\Rightarrow2x=117+9\)

\(\Rightarrow2x=126\)

\(\Rightarrow x=126:2\)

\(\Rightarrow x=63\)

Vậy \(x=63\)

Chúc bạn học tốt !!!

Answer 3

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

Answer 4

. là nhân nha

Answer 5

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

\(\Leftrightarrow\left(2x-9\right).80\)

\(=270.89\)

\(2x-9=\left(240.89\right)\div80\)

\(2x-9=117\)

\(2x=117+9\)

\(2x=126\)

\(x=126\div2\)

Vậy ........

\(\Rightarrow x=63\)