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Автор - alisa211204

Помогите пожалуйста решить номера 15-25, пожалуйста
Очень срочно!!!!!
Заранее спасибо.

Ответ

Автор - kboranbai

Ответ:

№15

 sqrt{ {20}^{2} }  =  sqrt{ {4x }^{2} +  {3x}^{2}  }

400=16х^2 +9х^2

400=25х^2

х^2=16

х=4

№17

AD^2=OA^2-OD^2

OA=AC/2=20/2=10

OD=BD/2=16/2=8

OA^2=100

OD^2=64

AD^2=100-64=36

AD=6

AD=BC=6

AB^2=AD^2+BD^2

AB^2= 36+256=292=2✓73

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