Question

[nghia trong]

Tìm y

7/4 - y x 4/3 = 5/19                                           y x 1/2 + 3/2 x y =4/5

Answer 1

[QuyenTran]

\(\frac{7}{4}-y.\frac{4}{3}=\frac{5}{19}\)

\(\Rightarrow y.\frac{4}{3}=\frac{7}{4}-\frac{5}{19}\)

\(\Rightarrow y.\frac{4}{3}=\frac{113}{76}\)

\(\Rightarrow y=\frac{113}{76}:\frac{4}{3}\)

\(\Rightarrow y=\frac{4}{3}.\frac{113}{76}\)

\(\Rightarrow y=\frac{113}{57}\)

vậy y= 113/57

Answer 2

[QuyenTran]

\(y.\frac{1}{2}+\frac{3}{2}.y=\frac{4}{5}\)

\(\Rightarrow y.\left(\frac{1}{2}+\frac{3}{2}\right)=\frac{4}{5}\)

\(\Rightarrow y.\frac{4}{2}=\frac{4}{5}\)

\(\Rightarrow y=\frac{4}{5}:\frac{4}{2}\)

\(\Rightarrow y=\frac{4}{5}.\frac{4}{2}\)

\(\Rightarrow y=\frac{8}{5}\)