Question

calcule:

1/2 + 3/7
-2/3 + 4/9
5/3 + (-1/2)
-1/3+(-1)​

Answer 1

Resposta:

$\frac{1}{2} + \frac{3}{7} = \frac{7 + 2 \times 3}{7 \times 2} = \frac{7 + 6}{14} = \frac{13}{14}$

$- \frac{2}{3} + \frac{4}{9} = \frac{ - 2 \times 9 + 4 \times 3}{3 \times 9} = \frac{ - 18 + 12}{27} = \frac{ - 6}{27} = \frac{ - 2}{9}$