Решите уравнения
а) 5,3x+2,7x=2,56
б) x*70=16,38

ЖЕДАЛЙАШОВАПРЫГНРМ ВППЦКП

Объяснение:

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х км/ч - скорость велосипедиста.

х+21 (км/ч) - скорость мотоциклиста, которая на 21 км/ч больше скорости велосипедиста, из условия задачи.

4*(х+21) (км) - расстояние, которое за 4 часа проехал мотоциклист между городами.

7х (км) - расстояние, которое за 7 часов проехал велосипедист между городами.

4*(х+21)=7х (км) - расстояние между городами, которое мотоциклист проехал, равно расстоянию между городами, которое велосипедист проехал - по условию задачи.

Тогда:

4*(х+21)=7х

4х+4*21=7х

4х+84=7х

4х-7х = -84

-3х = -84

х = -84: (-3)

х=28 (км/ч) - скорость велосипедиста.

28+21=49 (км/ч) - скорость мотоциклиста.

49*4=196 (км) - растояние между городами, которое проехал мотоциклист

или

28*7=196 (км) - растояние между городами, которое проехал велосипедист.

Проверка

196 = 196

ответ: 28 км/ч; 49 км/ч; 196 км.