Question

Daca $\frac{2}{x} = \frac{y}{7}$ , atunci numarul xy-20 este egal cu...?

Answer 1

2/x=y/7
xy=14

xy-20=14-20=-6

Answer 2

$\frac{2}{x} = \frac{y}{7} => xy=2*7=14$ (se inmultesc mezi cu extremi)
$xy-20=14-20= -6$