Предмет: Математика, автор: Nyshku

а) Во время весеннего сева за первую неделю было засеяно 3/7 пашни , а за вторую - оставшиеся 76 га . Найдите площадь пашни .
б) За первый день автотуристы проехали 48% пути , а за второй - оставщиеся 1092 км . Найдите длину пути .
в) Площадь комнаты 15,4 м² , что составиляет 22% площади всей квартиры . Найдите площадь квартиры.
5 класс
Подробнно !

Ответы

Автор ответа: son28
24
а)1 Сколько частей пашни засеяли за вторую неделю
1 - 3/7=4/7
2 Сколько га в 1/7 части
76:4=19 га
3 Сколько га засеяли в первую неделю
19*3=57 га
4 Площадь всей пашни
57+76=133 га  
б)
100%-48%=52% - это оставшийся путь, он равен 1092 км. Чтобы узнать сколько километров в 1% пути нужно 1092:52=21 км. Посчитаем сколько километров автотуристы проехали за первый день 48*21=1008 км. 
Чтобы рассчитать длину всего пути нужно 1008+1092=2100 км.
Ответ: длина всего пути 2100 км.
в)
22%=0,2215,4:0,22=70 кв м площадь квартиры

son28: я изменила там 1
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