Сократите дробь 75/45, 38/66 , 54/90, 36/84 надо

75/45=25/9. 38/66=19/33. 54/90=3/5. 36/84=3/7

Ократите дроби рациональным способом: 2) 15/18, 24/30, 28/32, 21/35;   3) 75/45, 38/66, 54/90, 36/84;   ;   4) 49/56,55/77, 26/65, 51/8515/18 = 5/6 24/30 = 4/5 28/32 = 7/8 21/35 = 3/5 75/45 = 5/3 = 1целая 2/3 38/66 = 19/33 54/90 = 27/45 = 9/15 = 3/5 36/84 = 18/42 = 9/21 = 3/7 49/56 = 7/8 55/77 = 5/7 26/65 = 2/5 51/85 = 3/5

                                  Стеллерова или морская корова!The black book of extinct animals and describes another species, discovered during the expedition of Vitus Bering in 1741. His ship called the "St. Peter" was wrecked near the coast of the island, later named after its discoverer. The team was forced to stay here for the winter and to eat unusual animals called cows due to the fact that they were eating sea grass. These creatures were huge and slow. Their weight often reaches ten tons. The meat of the sea cow was very tasty and useful. Hunting on these harmless giants had not been difficult, as the animals calmly eating algae close to the coast, were not able to escape in the depth and wasn't afraid of the man. In the end, after the expedition to the Islands of profit brutal hunters who killed all the population of the sea cows for some three decades

Пошаговое объяснение:

а)

600/100=6-это 1 процент

6*85=510кг-потеряет в весе

600-510=90кг-получится из 600 кг травы

1500/100=15(это 1 процент от 1500)

15*85=1275кг(потеряет в весе)

1500-1275=225кг(получится из 1500 кг травы)

1 тонна=1000кг

11,8*1000=11800кг

11800/100-118

118*85=10030

11800-10030=1770

 

б)

1500-это 15 процентов от всей травы

100кг-это 1 процент

100*100=10000 кг

что бы заготовить 1500 сена понадобилось 10000кг травы

 

3300-это 15 процентов

3300/15=220

220-это 1 процент

220*100=22000кг что бы заготовить 3300кг сена понадобиться 22000 кг травы

 

1т=1000кг

3,6т=3600кг сена

3600-это 15

процентов

3600/15=240

240-это 1 процент

240*100=24000кг

чтобы заготовить 3,6т сена понадобиться 240000кг травы