Question

Tìm số nguyên x, biết rằng \(\frac{2x-9}{240}\)= \(\frac{39}{80}\)

Answer 1

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

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

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

\(x=126:2=63\)

Answer 2

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

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

\(\Rightarrow2x-9=117\)

\(2x=117+9\)

\(2x=126\)

\(x=126:2\)

\(x=63\)