\(2,5x+9=3,75x-13,5\)
\(\Rightarrow3,75x-2,5x=9+13,5\)
\(\Rightarrow1,25x=22,5\)
\(\Rightarrow x=18\)
Bài làm:
Ta có: \(x.2,5+9=x.3,75-13,5\)
\(\Leftrightarrow\frac{5}{2}x+9=\frac{15}{4}x-13,5\)
\(\Leftrightarrow\frac{15}{4}x-\frac{5}{2}x=13,5+9\)
\(\Leftrightarrow\frac{5}{4}x=\frac{45}{2}\)
\(\Leftrightarrow x=\frac{45}{2}\div\frac{5}{4}\)
\(\Rightarrow x=18\)
cảm ơn bạn ''kyo-kun'' very much rất nhiều !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1
