\(\frac{7}{4}-y.\frac{4}{3}=\frac{5}{19}\)
\(\Rightarrow y.\frac{4}{3}=\frac{7}{4}-\frac{5}{19}\)
\(\Rightarrow y.\frac{4}{3}=\frac{113}{76}\)
\(\Rightarrow y=\frac{113}{76}:\frac{4}{3}\)
\(\Rightarrow y=\frac{4}{3}.\frac{113}{76}\)
\(\Rightarrow y=\frac{113}{57}\)
vậy y= 113/57
\(y.\frac{1}{2}+\frac{3}{2}.y=\frac{4}{5}\)
\(\Rightarrow y.\left(\frac{1}{2}+\frac{3}{2}\right)=\frac{4}{5}\)
\(\Rightarrow y.\frac{4}{2}=\frac{4}{5}\)
\(\Rightarrow y=\frac{4}{5}:\frac{4}{2}\)
\(\Rightarrow y=\frac{4}{5}.\frac{4}{2}\)
\(\Rightarrow y=\frac{8}{5}\)
