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Выполни умножение а)3/8*2; б)5/18*12; в) 7/15*40; г) 7/8*24; д)1/2*30; е) 9/11*11; ж) 2/3*1; е) 19/20*0.

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Alena824
А)3/4
б)1/3
в)56/3
г)21
д)15
е)9
ж)2/3
е)0
tagirova1

Пошаговое объяснение:

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Sergei_Olga658

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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Выполни умножение а)3/8*2; б)5/18*12; в) 7/15*40; г) 7/8*24; д)1/2*30; е) 9/11*11; ж) 2/3*1; е) 19/20*0.
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