Question

(1/7) + (-3/9)=
Ayuda banda xd​

Answer 1

Respuesta:

$( \frac{1}{7} ) + ( - \frac{3}{9} ) = \\ \\ \frac{1}{7} - \frac{3}{9} = \\ \\ \frac{(1 \times 9) - (7 \times 3)}{7 \times 9} = \\ \\ \frac{9 - 21}{63} = \\ \\ \frac{ - 12}{63} = \frac{ - 4}{21}$