Question

Tìm y

a,42/25:y/5=6/5

b,24/y:8/3=3/5

c,y*5/6=3/2

d,4/7*y=15/28

 

Answer 1

\(a,\frac{42}{25}:\frac{y}{5}=\frac{6}{5}\)

\(\frac{y}{5}=\frac{42}{25}:\frac{6}{5}\)

\(\frac{y}{5}=\frac{42}{25}\times\frac{5}{6}\)

\(\frac{y}{5}=\frac{7}{5}\)

\(\Leftrightarrow5y=7.5\)

\(5y=35\)

\(y=7\)

Answer 2

\(b,\frac{24}{y}:\frac{8}{3}=\frac{3}{5}\)

\(\frac{24}{y}=\frac{3}{5}\times\frac{8}{3}\)

\(\frac{24}{y}=\frac{8}{5}\)

\(\Leftrightarrow8y=24.5\)

\(8y=120\)

\(y=15\)

Answer 3

\(\frac{5}{6}y=\frac{3}{2}\)

\(y=\frac{3}{2}:\frac{5}{6}\)

\(y=\frac{3}{2}\times\frac{6}{5}\)

\(y=\frac{9}{5}\)