Question

tìm a biết:4/5-1/a=3/10

Answer 1

`4/5 -1/a =3/10`

`=>1/a=4/5-3/10`

`=>1/a=8/10-3/10`

`=>1/a=1/2`

`=>a=2`

Answer 2

\(\dfrac{4}{5}-\dfrac{1}{a}=\dfrac{3}{10}\)
\(\dfrac{1}{a}=\dfrac{4}{5}-\dfrac{3}{10}\)
\(\dfrac{1}{a}=\dfrac{5}{10}\)
\(\dfrac{1}{a}=\dfrac{1}{2}\)
\(a=2\)

Answer 3

\(\dfrac{4}{5}-\dfrac{1}{a}=\dfrac{3}{10}\)

\(\dfrac{1}{a}=\dfrac{4}{5}-\dfrac{3}{10}\)

\(\dfrac{1}{a}=\dfrac{5}{10}\)

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

\(a=2\)