Oblicz:
a) 2/9 + 8/9
b) 6/11 + 5/11
c) 7/15 + 9/15
d) 3 5/7 + 1 3/7
e) 1 5/9 + 2 4/9
f) 8 3/4 + 9 3/4
g) 84 1/5 + 5 4/5
h) 2 17/20 + 6 4/20
i) 15 8/9 + 9 6/9
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a) 2/9 + 8/9 = 10/9 = 1 1/9
b) 6/11 + 5/11 = 11/11 = 1
c) 7/15 + 9/15 = 16/15 = 1 1/15
d) 3 5/7 + 1 3/7 = 4 8/7 = 5 1/7
e) 1 5/9 + 2 4/9 = 3 9/9 = 4
f) 8 3/4 + 9 3/4 = 17 6/4 = 18 2/4 = 18 1/4 da się skrócić
g) 84 1/5 + 5 4/5 = 89 5/5 = 90
h) 2 17/20 + 6 4/20 = 8 21/20 = 9 1/20
i) 15 8/9 + 9 6/9 = 24 14/9 = 25 5/9