Câu c là : \(\frac{y}{2}-\frac{y}{5}+\frac{2}{5}=\frac{9}{10}\)
a)
37,5:y=96-94,5
37,5:y=1,5
y =37,5:1,5
y =25.
Chúc bạn học giỏi!
b)
\(a,96-\left(37,5:y\right)=94\)
\(\Rightarrow37,5:y=96-94\)
\(\Rightarrow37,5:y=2\Rightarrow y=37,5:2=18,75\)
\(b,613:\left(12+y\right)=1539\\ \)
\(\Rightarrow12+y=\frac{613}{1539}\Rightarrow y=\frac{613}{1539}-12\)
\(c,\frac{y}{2}-\frac{y}{5}+\frac{2}{5}=\frac{9}{10}\)
\(\Rightarrow\frac{3y+4}{10}=\frac{9}{10}\)
\(\Rightarrow3y+4=9\)
\(\Rightarrow y=\frac{5}{3}\)