Question

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

Answer 1

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
$- frac{1*1}{1*8} - frac{4*1}{4*2} =- frac{1}{8} - frac{4}{8} = frac{-1-4}{8} = -frac{5}{8}$

Answer 2

а можно решение?