Question

Tìm y 

a, 5/y = 1/2 

b, 42/25 ; y/5 = 6/5 

 

Answer 1

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

\(y=5:\left(\dfrac{1}{2}\right)\)

\(y=5\times2\)

\(y=10\)

----------------------

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

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

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

\(y=7\)

Answer 2

`a, 5/y = 1/2`

`y =10`

`b, 42/25 : y/5 = 6/5`

`42/(5y) = 6/5`.

`y = 7`.

Answer 3

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

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

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

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

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

\(\dfrac{y}{5}=\dfrac{210}{150}=\dfrac{7}{3}\)