Question

tim so tu nhin a be nhat thoa man dieu kien: 20/a< 4/5

Answer 1

20/a<4/5

=20/a<20/25

=20/26<20/25

=>a=26

Answer 2

       \(\frac{20}{a}< \frac{4}{5}\)

\(\Rightarrow\frac{20}{a}< \frac{20}{25}\)

\(\Rightarrow\)\(a=\left\{26;27;28;29;30;31;...\right\}\)

\(\text{Mà a bé nhất nên a = 26}\)

\(\text{Vậy a = 26}\)