Odpowiedź:
2.
b)
5 - 4 5/6 + 2 1/8 = 4 6/6 - 4 5/6 + 2 1/8 = 1/6 + 2 1/8 = 4/24 + 2 3/24 =
= 2 7/24
c)
7 3/4 - 2,2 - ( 3 1/2 - 1,8 + 5 1/4)= 7,75 - 2,2 - ( 3,5 - 1,8 + 5,25) =
= 7,55 - (1,7 + 5,25) = 7,55 - 6,95 = 0,6
d)
1 5/12 - (3 7/15 - 2 3/10) = 1 5/12 - ( 3 14/30 - 2 9/30) = 1 5/12 - 1 5/30 =
= 1 5/12 - 1 1/6 = 1 5/12 - 1 2/12 = 3/12 = 1/4
4.
a) 2/7 + 5/9 = 18/63 + 35/63 = 53/63
b) 1/5 - 1 1/4 = 4/20 - 1 5/20 = - 1 1/20
