Предмет: Математика, автор: scor2820

ПОМОГИТЕ Я НЕ ПОНИМАЮ МАТЕМАТИКУ

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Автор ответа: Пеппер

Ответ:

13 1/6 км/год.

Пошаговое объяснение:

13 4/5 = 13,8

12 7/10 = 12,7

Весь пройдений шлях поділимо на весь затрачений час:

13,8 + 13 + 12,7 = 39,5 (км)

1+1+1=3 (год)

39,5 : 3 = 395/30 = 13 1/6 (км/год) середня швидкість

Автор ответа: pushpull

Ответ:

средняя скорость велосипедиста на всем пути равна 13,2 км/час

Пошаговое объяснение:

Это скорее физика, чем математика.

Ну, все равно.

Средняя скорость Vср на всем пути определяется как отношение всего пути S ко всему времени его прохождения

Vср = S/t.

В нашем случае велосипедист по условию ехал t=3 часа.

Путь для удобства исчисления переведем в десятичные дроби

$\displaystyle 13\frac{4}{5} =13.8\\\\\\12\frac{7}{10} = 12.7$

и тогда за все время (3 часа) велосипедист проехал

S = (13.8 + 12.7 + 13) = 39.5 (км)

Средняя скорость на всем пути равна

$\displaystyle S = \frac{39.5}{3} =13.1(6)\approx 13.2$ (км/час)

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