Răspuns:
[tex](a.b) d.p(2.9) = > \frac{a}{2} = \frac{b}{9} = k \\ \frac{a}{2} = k = >a = 2k \\ \frac{b}{9} = k = > b = 9k \\ a \times b = 72 \\ 2k \times 9k = 72 \\ 18k = 72 \\ k = \frac{72}{18 } \\ k = 4 \\ a = 2k = 2 \times 4 = > a =8 \\ b = 9k = 9 \times 4 = > b = 36[/tex]
