Question

Число (21:13)-(21:8)=

Answer 1

1) 21 : 13 = 21/13 = 1 8/13
2) 21 : 8 = 21/8 = 2 5/8
3) 1 8/13 - 2 5/8 = 1 64/104 - 2 65/104 = 1 64/104 - 1 169/104 = - 105/104 = - 1 1/104
Ответ - 1 1/104

Answer 2

$frac{21}{13}-frac{21}{8}=frac{168}{104}-frac{273}{104}=-frac{105}{104}=-1frac{1}{104}$