Предмет: Математика, автор: Аноним

 Скорость полёта утки 50 км/ч Что составляет 5/9 скорости полёта дикого гуся, а скорость полёта дикого гуся ровна 5/7 скорости полёта чёрного стрижа.

 

 

Вычисли скорость полёта чёрного стрижа.

 

 

Ответы

Автор ответа: antonliakhovskii
7

Решение

1) Составим пропорцию:

50 км/ч - \frac{5}{9}

скорость гуся км/ч - 1 целая часть ( \frac{9}{9} )

скорость гуся = 50*1: \frac{5}{9} = \frac{50*9}{5} = 90 (км/ч)

2) 90 км/ч - \frac{5}{7}

скорость стрижа, км/ч - 1 целая часть

скорость стрижа = 90*1: \frac{5}{7} = \frac{90*7}{5} = 126 (км/ч)

ОТВЕТ: скорость полёта чёрного стрижа равна 126 км/ч.

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