Question

Oblicz
1. a) 2 2/7+4/7
b) 5 3/7 +2 5/7
c)54/9-1/9
d)8-3/5
e) 7 2/7-5/7
2. oblicz
5/6+3/5
23 2/3+5 7/9
2 5/12+ 3/8
5 7/18 + 2 5/6
4/7- 1/3
6 5/12-4 5/6
4 2/7 -2
3 1/3-2/5

Answer 1

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Zad.1
a) 2 2/7 + 4/7 = 2 6/7
b) 5 3/7 + 2 5/7 = 8 1/7
c) 54/9 -1/9 = 53/9 = 5 8/9
d) 8 - 3/5  = 8/1 - 3/5 = 40/5 - 3/5 = 37/5 = 7 2/5
e) 7 2/7 - 5/7 = 6 9/7 - 5/7 = 6 4/7

Zad.2
a) 5/6 + 3/5 = 25/30 + 18/30 = 43/30 = 1 13/30
b) 23 2/3 + 5 7/9 = 23 6/9 + 5 7/9 = 29 4/9
c) 2 5/12 + 3/8 = 2 10/24 + 9/24 = 2 19/24
d) 5 7/18 + 2 5/6 = 5 7/18 + 2 15/18 = 8 4/18
e) 4/7 - 1/3 = 12/21 - 7/21 = 19/21
f) 6 5/12 - 4 5/6 = 6 5/12 -4 10/12 = 5 17/12 - 4 10/12 = 1 7/12
g) 4 2/7 - 2 = 2 2/7
h) 3 1/3 - 2/5 = 3 5/15 - 6/15 = 2 20/15 - 6/15 = 2 14/15