31/80+(3/16+39/80) 2/45+(3/45+7/9) (3/7+5/14)+1/14 7/15+(2/15+1/5) 3/16+(1/16+5/8)...

Question

31/80+(3/16+39/80)
2/45+(3/45+7/9)
(3/7+5/14)+1/14
7/15+(2/15+1/5)
3/16+(1/16+5/8)
(1/13+1/14)+12/13

Answer 1

1) 17/16
2) 8/9
3) 6/7
4) 4/5
5) 7/8
6) 15/14

Comments

f rjulf&

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а когда?

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через пол часика

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ok

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31/80+15+39/80, 31/80+54/80, 31+54/80, 85/80, сокращаем и получаем 17/16

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2/45+(1/15+7/9), 2/45+3+35/45, 2/45+38/45, 2+38/45, 8/9

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5+6/14+1/14, 11/14+1/14, 11+1/14, 12/14, 6/7

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7/15+2+3/15, 7/15+5/15, 7+5/15, 12/15, 4/5

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3/16+1+10/16, 3/16+11/16, 3+11/16, 14/16, 7/8

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14+13/182+12/13, 27/182+12/13, 27+168/182, 195/182, 15/14