Odpowiedź:
a) 3/7 - 1/14 = 3/7*2 = 6/14 - 1 /14 = 5/14
b) 3/20 + 1/5 = 1/5 * 4 = 4/20 + 3/20 = 7/20
c) 2/3 + 1/5 = 2/3 * 5 = 10/15 + 1/5 * 3 = 3/15 + 10/15 = 13/15
d) 3/4 - 1/3 = 3/4 * 3 = 6/12 - 1/3 * 4 = 6/12 - 4/12 = 2/12
e) 4/5 + 4/7 = 4/5 * 7 = 28/35 + 4/7 * 5 = 28/35 + 20/35 = 48/35 = 1 13/35
f) 4/8 - 1/3 = 4/8 * 3 - 1/3 * 8 = 12/24 - 8/24 = 4/24
g) 5/6 + 1/9 = 5/6 * 9 + 1/9 * 6 = 45/54 + 6/54 = 51/54
h) 3/9 - 4/12 = 3/9 * 12 - 4/12 * 9 = 36/ 108 - 36/108 = 0/108
i) 3 1/7 + 2 1/5 = 3 1/7 * 5 + 2 1/5 * 7 = 3 5/35 + 2 7/35 = 5 12/35
j) 10 6/11 - 3 4/22 = 10 6/11 * 2 - 3 4/22 = 10 12/22 - 3 4/22 = 7 8/22
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Liczę na naj! :)
