Question

A + B = 1,5 ; A-B = 0,6. Afla cat este A ? Afla cat este B?

Answer 1

$a = \frac{3}{2} - b$
$\frac{3}{2} - b - b = \frac{ 3}{5}$
$2 \times ( - b) = \frac{9}{10}$
$- b = \frac{9}{10} \times \frac{1}{2}$
$b = - \frac{9}{20}$
$a = \frac{39}{20}$