Question

a,5/y=1/2 (tìm y)

b,42/25:y/5=6/5(tìm y)

Giup tui vs

Answer 1

a) \(\dfrac{5}{y}=\dfrac{1}{2}\)

\(y=\dfrac{5\times2}{1}=10\)

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

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

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

\(y=7\)

Answer 2

\(\dfrac{5}{y}=\dfrac{1}{2}\\ =>y=5.2:1=10\)

 

\(\dfrac{42}{25}:\dfrac{y}{5}=\dfrac{6}{5}\\ =>\dfrac{y}{5}=\dfrac{42}{25}:\dfrac{6}{5}=\dfrac{42}{25}.\dfrac{5}{6}=\dfrac{7}{5}\\ =>y=\dfrac{7}{5}.5=7\)

Answer 3

a) \(\dfrac{5}{y}=\dfrac{1}{2}\)

\(\Rightarrow y=5\cdot2:1=10\)

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

\(\dfrac{y}{5}=\dfrac{42}{25}:\dfrac{6}{5}=\dfrac{7}{5}\)

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

\(\Rightarrow y=7\)