Odpowiedź:
zadanie 1 - B
zadanie 2 - C
zadanie 3
a) 3/4 + 1/5 = 15/20 + 4/20 = 19/20
b) 2/3 - 3/7 = 14/21 - 9/21 = 5/21
zadanie 4
a) 1 6/7 + 5/7 = 1 11/7 = 2 4/7
b) 1 1/3 + 2 5/8 =1 8/24 + 2 15/24 = 3 23/24
c) 1 2/13 - 9/13 =15/13 - 9/13 = 6/13
d) 5 5/8 - 3 1/2 = 5 10/16 - 3 8/16 = 2 2/16
zadanie 5
a) 1 2/3 + 2 3/4 = 1 8/12 + 2 9/12 = 3 17/12 = 4 5/12
b) 4 2/5 - 2 5/8 = 4 16/40 - 2 25/40 = 3 56/40 - 2 25/40 = 1 21/40
zadanie 6
a) 1 2/5 + 1/8 = 1 16/40 + 5/40 = 1 21/40
b) 4 3/5 + 2 2/3 = 4 9/15 + 2 10/15 = 6 19/15 = 7 4/15
c) 5 3/5 - 1 1/4 = 5 12/20 - 1 5/20 = 4 7/20
d) 5 2/5 - 3 7/10 =5 4/10 -3 7/10 = 4 14/10 - 3 7/10 = 1 7/10
