Question

Tìm y 

a) 5/y = 1/2 

b) 42/25 : y/5 =6/5

giúp mình với ạ ='))

 

Answer 1

\(a,\dfrac{5}{y}=\dfrac{1}{2}\)

   \(\dfrac{5}{y}=\dfrac{5}{10}\)

\(\Rightarrow y=10\)

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

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

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

\(\Rightarrow y=7\)

Answer 2

\(a)\dfrac{5}{y}=\dfrac{1}{2}<=>\dfrac{5}{10}=\dfrac{1}{2} nên => \dfrac{5}{y}=\dfrac{5}{10}=y=10\)

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

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

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