Odpowiedź:
zad 5
liczba liczba przeciwna liczba odwrotna
5 - 5 1/5
- 3/5 3/5 - 5/3
1,7 - 1,7 10/17
- 2 3/4 2 3/4 4/11
zad 6
- 1 1/2 + 2/3 = - 1 3/6 + 4/6 = - 9/6 + 4/6 = - 5/6
10 - 2 1/4 = 9 4/4 - 2 1/4 = 7 3/4
1 5/6 - 2 1/3 = 1 5/6 - 2 2/6 = 1 5/6 - 1 8/6 = 3/6 = 1/3
1 2/5 * 5/14 = 7/5 * 5/14 = 1 * 1/2 = 1/2
- 3 5/7 : 13/14 = - 26/7 * 14/13 = - 2 * 2 = - 4
( 3 1/2 - 2 1/4) * 2 2/3 = ( 3 2/4 - 2 1/4) * 8/3 = 1 1/4 * 8/3 = 5/4 * 8/3 = 5 * 2/3 =
= 10/3 = 3 1/3
- 4 1/2 + 3 * 2 3/4 = - 4 1/2 + 3 * 11/4 = - 4 1/2 + 33/4 = - 4 2/4 + 8 1/4 =
= - 4 2/4 + 7 5/4 = 3 3/4
