Вопрос школьника по предмету Математика
СРОЧНО Из деревни Дубково в 9 часов утра выехал велосипедист, а из деревни Сосновка в 10 ч утра ему навстречу выехал мотоциклист, который за час проезжает на 28,4 км больше, чем велосипедист. Они встретились в 10 ч 39 минут. Найдите скорости велосипедиста и мотоциклиста, если расстояние между деревнями 54,8 КМ.
Ответ учителя по предмету Математика
х км/ч — скорость вело
(х + 28,4) км/ч — скорость мото
10 ч 39 мин. — 9 ч = 1 ч 39 мин. = 1,65 ч — был в пути вело
10 ч 39 мин. — 10 ч = 39 мин. = 0,65 ч — был в пути мото
1,65х — проехал до встречи вело
(х + 28,4) * 0,65 — проехал до встречи мото
1) 1,65х + (х + 28,4) * 0,65 = 54,8
1,65х + 0,65х + 18,46 = 54,8
2,3х = 54,8 — 18,46
2,3х = 36,34
х = 36,34 : 2,3
х =
15,8 км/ч — скорость вело
2) 15,8 + 28,4 =
44,2 км/ч — скорость мото.
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Где, когда, откуда, куда, как.
От данных слов образуйте наречия обозначая приставки и суффиксы по образцу :по-другому
г) четвертый, пятый, восьмой, девятый
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3 клаасс