Предмет: Алгебра, автор: kirilertman9

СРОЧНО!!!!!ДАЮ 100 БАЛОВ
Розв язати задачу

Приложения:

Ответы

Автор ответа: Пеппер

0

Ответ:

35 км/год.

Объяснение:

7/17 * 255=105 (км) проїхав до зупинки

255 - 105 = 150 (км) проїхав після зупинки

х км/год - швидкість до зупинки

х-5 км/год швидкість після зупинки

9-1=8 (год) час руху

105/х + 150/(х-5) = 8

105х-525+150х-8х²+40х=0

8х²-295х+525=0

х=(295±√(87025-16800))/16=(295±√70225)/16=(295±265)/16

х=1,875 (не підходить) х=35

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