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ккк127
ккк127
14.09.2020 10:30 •  Алгебра

Кто может всегда мне с контрольной по математике напиши те

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Ответ:
skymiss
skymiss
02.09.2022 12:11

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Must Waste More Time...

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Must Waste More Time...

0,0(0 оценок)
Ответ:
ruzannakokh
ruzannakokh
19.11.2022 15:35
Итак 
пусть Х-скорость катера,V-скорость течения=скорости плота;скорость катера по течению =4\3 скорости катера против течения;
составлю уравнение:
96\(x+v)=14-((96*3)\(4x-4v))
384x-384v=52x^2-52vx-288x+52vx-52v^2-288v
96(x-v)=52(x^2-v^2)
x+v=24\13__скорость катера по течению
24\13=4x-4v\3
52x-52v=72
x-v=18\13___скорость катера против течения
из обоих выражений выражем v и приравнивем
x-18\13=24\13-x
2x=42\13
x=21\13
теперь можно заметить что плот проплывет Yкм тогда катер на обратном пути проплывет (96-y) значит можно составить уравнение 
y\(3\13)=(96-y)*18\13
дальше тупо вырази y -это и будет ответудачи!
0,0(0 оценок)
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