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Qwerfcsfvfw
Qwerfcsfvfw
03.09.2021 07:46 •  Математика

Проверьте верны ли равенства 1) 18 1/3 (-6/11а-0.6б+0.3с)-4.5с=3/7(-21а-23 1/3б+2 1/3с)-а-б​

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Ответ:
kyzmina97
kyzmina97
31.03.2020 06:46

Пошаговое объяснение:

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Ответ:
Вико1234
Вико1234
24.03.2022 00:46

В решении.

Пошаговое объяснение:

Расстояние по трассе между двумя посёлками 1540 м. Из этих посёлков одновременно навстречу друг другу выехали два велосипедиста. Скорость первого равна 3 м/с, скорость второго 4 м/с. Какое расстояние будет между велосипедистами через 3 мин после начала движения? Через какое время после начала движения велосипедисты встретятся?

Формула движения: S=v*t

S - расстояние            v - скорость             t – время

3 минуты=60*3=180 секунд.

1)Найти расстояние 1 велосипедиста:

3*180=540 (м).

2)Найти расстояние 2 велосипедиста:

4*180=720 (м).

3)Какое расстояние будет между велосипедистами через 3 мин после начала движения?

1540 - (540+720)= 280 (м).

4)Через какое время после начала движения велосипедисты встретятся?

Общее расстояние 1540 м.

Общая скорость 3+4=7 (м/сек).

Общее время: 1540 : 7 = 220 (сек.)

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