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10+8+7
25
2.-8/12+4/7+4/5
280+240+336
856
3.- 3/5+2/7+6/9
189+90+210
489
4.-6/2-5/7
3-5/7
(21-5)/7
16/7
2,29
5.-8/3-4/9
(24-4)9
20/9
2,22
6.-12/8-5/9
3/2-5/9
(27-10)18
17/18
0,94