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Alenka341
Alenka341
18.01.2021 21:37 •  Алгебра

Дано: Треугольник ABC
O - центр вписанной окружности
AC=BC=10
AB=12
OD перпенликулярно к ABC
OD=1
Найти: DC-?

👇
Ответ:

p=(2*10+12)/2=16

S=12/4*v(4*10^2-12^2)=3*v(400-144)=3*v256=3*16=48

r=48/16=3

расстояние от D до АС=v(1^2+3^2)=v(1+9)=v10

DC=v((v10)^2+(12/2)^2)=v(10+36)=v46

4,8(36 оценок)
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Ответ:
Zein304
Zein304
18.01.2021

12 км/час

Объяснение:

Моторная лодка за 8 часов проплыла 45 км против течения и вернулась обратно. Найди скорость моторной лодки в стоячей воде, если скорость течения реки равна 3 км/час.

Скорость моторной лодки в стоячей воде v км/час

Скорость моторной лодки против течения (v-3) км/час

Скорость моторной лодки по течению (v+3) км/час

Время затраченное на путь против течения 45/(x-3) час

Время затраченное на путь по течению 45/(x+3) час

45/(x-3)+45/(x+3)=8

(x-3)(x+3)(45/(x-3)+45/(x+3))=8(x-3)(x+3)

45(x+3)+45(x-3)=8(x²-9)

45x+135+45x-135=8x²-72

8x²-90x-72=0

4x²-45x-36=0

D=2025+576=2601=51²

x₁=(45-51)/8=-3/4<0

x₂=(45+51)/8=12 км/час

4,5(21 оценок)
Ответ:
гсооагвгв
гсооагвгв
18.01.2021

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