Предмет: Алгебра, автор: Аноним

Помогите пожалуйста решить

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Автор ответа: fenix6810

1

Ответ:

Объяснение:

a=9 большая полуось

2с=7 = F1F2

c²=a²-b²

b²=a²-c²=9²-3,5²=68,75

x²/81+y²/68,75=1 каноническое уравнение эллипса

ε=с/a=3,5/9≈0,39 эксцентриситет

x=+-a²/c=+-81/3,5

x=+-23 1/7 уравнение директрис

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