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Melonpan
@Melonpan
August 2022
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8 КЛАСС............................
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sedinalana
v S t
по течению х+2 50 50/(х+2)
против течения х-2 8 8/(х-2)
50/(х+2)+8/(х-2)=3
3(х-2)(х+2)-50(х-2)-8(х+2)=0
3х²-12-50х+100-8х-16=0
3х²-58х+72=0
D=3364-864=2500
x1=(58-50)/6=4/3=1 1/3 не удов усл
х2=(58+50)/6=18км/ч собственная скорость
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Answers & Comments
по течению х+2 50 50/(х+2)
против течения х-2 8 8/(х-2)
50/(х+2)+8/(х-2)=3
3(х-2)(х+2)-50(х-2)-8(х+2)=0
3х²-12-50х+100-8х-16=0
3х²-58х+72=0
D=3364-864=2500
x1=(58-50)/6=4/3=1 1/3 не удов усл
х2=(58+50)/6=18км/ч собственная скорость