Question

[Nguyễn Phương Anh‏]

Tìm y :

a, \(\frac{3}{5}\) x y  + \(\frac{1}{2}\): \(\frac{5}{3}\)- \(\frac{5}{4}\) = \(\frac{1}{2}\)x \(\frac{1}{3}\)

b , \(\frac{4}{5}\): y + \(\frac{1}{4}\)x \(\frac{1}{6}\)- \(\frac{1}{2}\)=  \(\frac{1}{3}\)x \(\frac{5}{2}\) 

c. \(\frac{3}{5}\)x  y  - \(\frac{4}{5}\): 3 + \(\frac{1}{12}\)= \(\frac{3}{2}\)+  \(\frac{1}{5}\)

* Ai giải đúng nhất mk k !

Answer 1

[Dương Lam Hàng]

a) \(\frac{3}{5}\times y+\frac{1}{2}:\frac{5}{3}-\frac{5}{4}=\frac{1}{2}\times\frac{1}{3}\)

\(\Rightarrow\frac{3}{5}\times y+\frac{3}{10}-\frac{5}{4}=\frac{1}{6}\)

\(\Rightarrow\frac{3}{5}\times y+\left(-\frac{19}{20}\right)=\frac{1}{6}\)

\(\Rightarrow\frac{3}{5}\times y=\frac{67}{60}\)

\(\Rightarrow y=\frac{67}{36}\)

b) \(\frac{4}{5}:y+\frac{1}{4}\times\frac{1}{6}-\frac{1}{2}=\frac{1}{3}\times\frac{5}{2}\)

\(\Rightarrow\frac{4}{5}:y+\frac{1}{24}-\frac{1}{2}=\frac{5}{6}\)

\(\Rightarrow\frac{4}{5}:y+\left(-\frac{11}{24}\right)=\frac{5}{6}\)

\(\Rightarrow\frac{4}{5}:y=\frac{5}{6}+\frac{11}{24}=\frac{31}{24}\)

\(\Rightarrow y=\frac{4}{5}:\frac{31}{24}=\frac{96}{155}\)

c) \(\frac{3}{5}\times y-\frac{4}{5}:3+\frac{1}{12}=\frac{3}{2}+\frac{1}{5}\)

\(\Rightarrow\frac{3}{5}\times y-\frac{4}{15}+\frac{1}{12}=\frac{17}{10}\)

\(\Rightarrow\frac{3}{5}\times y-\frac{4}{15}=\frac{97}{60}\)

\(\Rightarrow\frac{3}{5}\times y=\frac{113}{60}\)

\(\Rightarrow y=\frac{113}{36}\)