kisuli1
13.08.2022 15:16

4. вычислить определенный интеграл с точностью до 0,001 путем предвари-
тельного разложения подінтегральной функции в ряд и почленного интегриро-
вания этого ряда:

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Ответ:
07Лизочек07
04.07.2022 06:50

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Must Waste More Time...

0,0(0 оценок)
Ответ:
ENOT234u
27.05.2022 12:29

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

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