55 5 5 расставить знаки чтобы получилось число 56

(5: 5)+55=56 1)5: 5=1 2)55+1=56

Это будет выглядеть вот так: 55+(5: 5)=56 =)

70 км/ч скорость автобуса

88 км/ч скорость грузовой машины

Пошаговое объяснение:

Пусть скорость автобуса х км/ч, тогда скорость грузовика (х+18) км/ч

Каждый был в пути 3 часа

474 км - общее расстояние, которое они проехали за 3 часа до встречи

1. х + (х + 18) = 2х+18 (км/ч) - скорость сближения автобуса и грузовика

Составим уравнение:

2. (2х+18)*3 = 474

6х + 54 = 474

6х = 474 - 54

6х = 420

х = 420/6

х = 70 (км/ч) скорость автобуса

3. 70 + 18 = 88 (км/ч) скорость грузовой машины

Проверим:

70*3 + 88*3 = 474

210 + 264 = 474

474 = 474 (км) расстояние, которое проехали за 3 часа автобус и грузовая машина

Пошаговое объяснение:

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