Răspuns :
Răspuns: [tex]\red{\boxed{\bf a\cdot b = 20}}[/tex]
[tex]\bf\dfrac{a}{5}= \dfrac{4}{b} \xrightarrow[~cu ~produsul~ extremilor~]{~produsul ~mezilor~}a\cdot b = 4\cdot 5 \implies \red{\boxed{\bf a\cdot b = 20}}[/tex]
Răspuns: [tex]\red{\boxed{\bf a\cdot b = 20}}[/tex]
[tex]\bf\dfrac{a}{5}= \dfrac{4}{b} \xrightarrow[~cu ~produsul~ extremilor~]{~produsul ~mezilor~}a\cdot b = 4\cdot 5 \implies \red{\boxed{\bf a\cdot b = 20}}[/tex]