Odpowiedź:
zad 3
a)
- 1 2/25 * (- 2 1/12) = 27/25 * 25/12 = 9 * 1/4 = 9/4 = 2 1/4
b)
4 1/7 - 4 1/2 : ( - 5 1/4) = 4 1/7 - 9/2 : ( - 21/4) = 4 1/7 - 9/2 * (- 4/21) =
= 4 1/7 - 3 * ( - 2/7) = 4 1/7 + 6/7 = 4 7/7 = 5
c)
- 2 1/9 * 1 16/19 : 7/5 = - 19/9 * 35/19 * 5/7 = - 1/9 * 35 * 5/7 = - 1/9 * 5 * 5 = - 25/9 =
= - 2 7/9
