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вика87
вика87
30.10.2020 12:11 •  Математика

Найти первообразную функции
f(x)=1+3x/2-x​

👇
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Ответ:
vavelichTabak
vavelichTabak
30.10.2020
Из условия сразу следует, что число телят кратно 10. иначе бы общая сумма на 0 не кончалась бы   Пусть быков a, коров b, а телят 10c. Тогда можно составить два уравнения: a + b + 10c = 100 и 20a + 10b + 10c = 200. Второе из этих уравнений можно переписать в виде 2a + b + c = 20. Итак, у нас есть система двух уравнений: a + b + 10c = 100 и 2a + b + c = 20. Из первого уравнения замечаем, что a + b кратно 10. так как a+b=100-10c=10(10-c) Из второго — a + b < 20. Значит, a + b = 10. Тогда, из первого уравнения, c = 9, а из второго 2a + b = 11. Отсюда находим: a = 1, b = 9, c = 9. Это значит, что в стаде 1 бык, 9 коров и 90 телят. 
4,7(22 оценок)
Ответ:
илья1899
илья1899
30.10.2020

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