Вычислите:1) 1/2-1/3-1/4; 2) 2/3-1/4-1/6; 3) 1/8-1/4-1/2

1) 1/6-1/4=-1/12
$\frac{2*1}{2*6} - \frac{3*1}{3*4} = \frac{2}{12} - \frac{3}{12} = \frac{2-3}{12} =- \frac{1}{12}$
2) 5/12-1/6=1/4
$\frac{1*5}{1*12} - \frac{2*1}{2*6} = \frac{5}{12}- \frac{2}{12} = \frac{5-2}{12}= \frac{3}{12} = \frac{1}{4}$
3) -1/8-1/2=-5/8
$- \frac{1*1}{1*8} - \frac{4*1}{4*2} =- \frac{1}{8} - \frac{4}{8} = \frac{-1-4}{8} = -\frac{5}{8}$