
Пошаговое объяснение:
Sorry, I didn't understand anything
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Смотрите.
1) Обозначаем t — сколько времени они шли в первый день, тогда (t-1) — сколько во второй.
2) Теперь следующее соотношение — про 6 километров. Пускай в первый день они км, а во второй день — s2, тогда нам дано:
s1-s2=6.
3) Вспоминая, что расстояние=время*скорость (s=v*t), подставляем в эту формулу вместо s1 и s2:
(3,5*t)-(3*(t-1))=6.
Упрощаем:
3,5t-3t+3=6;
0,5t=3;
t=6.
ответ: Таким образом, в первый день они шли 6 часов. Во второй день — 6-1=5 (часов во второй день — 3*5 = 15 (км)
Пошаговое объяснение:
См. Пошаговое объяснение
Пошаговое объяснение:
1. Делится ли сумма:
а) 100+250+75+500 делится на 25 - да, т.к. каждое слагаемое делится на 25.
б) 18+27+36+81 делится на 9 - да, т.к. каждое слагаемое делится на 9.
в) 44+68+88+96 делится на 4 - да, т.к. каждое слагаемое делится на 4.
г) 18+180+36+21 делится на 6 - нет, т.к. одно из слагаемых (21) не делится на 6;
д) 16+42+52+23 делится на 2 - нет, т.к. одно из слагаемых (23) не делится на 2;
2. Делится ли произведение:
а) 16*250 делится на 8 - да, т.к. один из сомножителей (16) делится на 8.
б) 26*75*32 делится на 20 - да, т.к. в результате умножения получится число, оканчивающееся двумя нулями.
в) 81*15*36 делится 27 - да, т.к. один из сомножителей (81) делится на 27.