Question

Vă rog din suflet ajutatima.

Answer 1

a)
$\frac{2}{7} + \frac{1}{7} + \frac{3}{7} + \frac{4}{7} = \frac{2 + 1 + 3 + 4}{7} = \frac{9}{7}$
b)
$\frac{1}{8} + 1 + \frac{3}{8} + \frac{4}{8} = \frac{1 + 8 + 3 + 4}{8} = \frac{16}{8} = 2$
Amplificam 1 cu 8

c)
$1 - ( \frac{7}{6} + \frac{4}{6} - \frac{3}{6} ) = \frac{1}{1} - \frac{7 + 4 - 3}{6} = \frac{1}{1} - \frac{8}{6} = \frac{6 - 8}{6} = - \frac{2}{6}$

d)
$x + \frac{3}{9} = \frac{6}{9} - \frac{1}{9} \\ x = \frac{5}{9} - \frac{3}{9} = \frac{2}{9}$

e)
$x - \frac{8}{12} = \frac{5}{12} + 1 \\ x = \frac{17}{12} + \frac{8}{12} = \frac{25}{12}$