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Емсимася
Емсимася
18.05.2020 13:14 •  Математика

Два рільники Іван і Григорій можуть зорати поле за 12 годин. За скількиигодин Іван може зорати все поде, якщо Іван всю роботу може закінчити на 10 годин раніше ніж Григорій?

👇
Ответ:
Arianalike
Arianalike
18.05.2020

12 * 2 = 24 (год) — зоре Григорій.

24 - 10 = 14 (год) — зоре Іван.

4,8(8 оценок)
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Ответ:
lenabogdanv1
lenabogdanv1
18.05.2020

Пусть было х блоков, тогда:
х-1/2х-(1/2)(5/9)х=8;
1/2х-5/18х=8;
9/18х-5/18х=8;
4/18х=8;
х=8÷4/18;
х=8×18/4;
х=36.
36×(1/2)=18(блоков)-1й мальчик;
18×(5/9)=10(блоков)-2й мальчик;
(18+8)÷10=26÷10=2.6=2_3/5(раза)-во столько больше положили 1й и 3й малики больше блоков, чем 2й.


1-1/2=1/2(блоков)-ост.после первого мальчика;
1/2 × 5/9=5/18(блоков)-использовал 2й мальчик;
1/2+5/18=9/18+5/18=14/18(блоков)-использовали 1й и 2й мальчики;
1- 14/18=18/18 - 14/18=4/18(блоков)-использовал 3й мальчик;
8÷4×18=36(блоков)-было всего.
36×(1/2)=18(блоков)-1й мальчик;
18×(5/9)=10(блоков)-2й мальчик;
(18+8)÷10=26÷10=2.6=2_3/5(раза)-во столько больше положили 1й и 3й малики больше блоков, чем 2й.
4,6(93 оценок)
Ответ:
ROMMIT2
ROMMIT2
18.05.2020

Пошаговое объяснение:

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4,4(68 оценок)
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