<span>Ответ : На обработку поля было затрачено : 3 4/7 + 11/14 + 1 1/6 = 25/7 + 11/14 + 7/6 = 150/42 + 33/42 + 49/42 = 232/42 = 5 22/42 = 5 11/21 часа</span>
А)1/3=2/6=6/18=7/21
б)13/7=26/14=130/70=104/56
в)2/5=6/15=10/25=28/70
г)80/120=8/12=2/3=10/15
д)6/11=12/22=30/55=36/66
<span>е)30/48=5/8=10/16=15/24</span>