Răspuns:
Explicație pas cu pas:
17.
4/17 + 1/17 = (4+1)/17 = 5/17 -> a realizat a doua zi
4/17 + 5/17 = 9/17 din lucrare a realizat in cele doua zile
1 - ( 4/17 + 5/17 ) = 17/17 - 9/17 = (17-9)/17 = 8/17 -> din lucrare mai are de realizat muncitorul
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18.
11/57 = 10/57 + 1/57
11/57 = 7/57 + 4/57
11/57 = 6/57 + 5/57
11/57 = 8/57 + 3/57
11/57 = 9/57 + 2/57
11/57 = 3/57 + 5/57 + 2/57 + 1/57
