Odpowiedź:
a)
- 1 2/7 - 3,75 = - 1 2/7 - 3 3/4 = - 1 8/28 - 3 21/28 = - 4 29/28 = - 5 1/28
b)
2 1/3 - 4,2 = 2 1/3 - 4 2/10 = 2 1/3 - 4 1/5 = 2 5/15 - 4 3/15 =
= 2 5/15 - 3 18/15 = - 1 13/15
c)
- 2,2 + 1 2/3 = - 2 2/10 + 1 2/3 = - 2 1/5 + 1 2/3 = - 2 3/15 + 1 10/15 =
= - 1 18/15 + 1 10/15 = - 8/15
d)
(- 1 2/3) : 4 - (- 4) * 1 1/4 = - 5/3 * 1/4 - (- 4 * 5/4) = - 5/12 - (- 20/4) =
= - 5/12 + 20/4 = - 5/12 + 4 = - 5/12 + 3 12/12 = 3 7/12
