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numucirad
numucirad
16.01.2021 02:21 •  Алгебра

Представьте квадратный трёхчлен 8x2-2x-1 и
12х2-х-1 в виде произведения двух двучленов

👇
Ответ:
a1b2c5612z
a1b2c5612z
16.01.2021
14x-1и 23x-1

Объяснение ……..
4,5(83 оценок)
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Ответ:
гсооагвгв
гсооагвгв
16.01.2021

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Must Waste More Time...

4,8(58 оценок)
Ответ:
senyacha15
senyacha15
16.01.2021
Х (км/ч) - собственная скорость баржи
х+5 (км/ч) - скорость баржи по течению реки
х-5 (км/ч) - скорость баржи против течения реки
48    (ч) - время движения баржи по течению реки
х+5
42  (ч) - время движения баржи против течения реки
х-5
Так как весь путь составил 5 часов, то составим уравнение:

48  +  42  =5
х+5    х-5

х≠5  х≠-5
Общий знаменатель: (х+5)(х-5)
48(х-5)+42(х+5)=5(х+5)(х-5)
48х-240+42х+210=5(х²-25)
90х-30=5х²-125
5х²-90х-95=0
х²-18х-19=0
Д=18²+4*19=324+76=400
х₁= 18-20 =-1  - не подходит по смыслу задачи
         2       
х₂=38 = 19 (км/ч) - собственная скорость баржи
      2
ответ: 19 км/ч.
4,4(87 оценок)
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