Ответы на вопрос:
1) 8/15 + 6/7 = 56+90/105 = 146/105 = 1 41/105
2) 13/6 + 9/8 = 52+27/24 = 79/24 = 3 7/24
3) 11/2 + 5/8 = 44+5/8 = 49/8 = 6 1/8
4) 7/34 + 2/17 = 7+4/34 = 11/34
5) 5/3 + 8/9 = 15+8/9 = 23/9 = 2 5/9
6) 11/80 + 4/15 = 33+64/240 = 94/240
7) 3/7 + 21/4 = 12+147/28 = 159/28 = 5 19/28
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