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Batman89
Batman89
08.04.2023 05:06 •  Алгебра

Выполни деление: (11m−8):(−2) .
1) 5,5m−8
2)−5,5m−2
3)Другой отв
4)−5,5m+4
5) 5,5m−4

👇
Ответ:
salta19
salta19
08.04.2023

3.другой ответ

4,8(30 оценок)
Ответ:
fayafaya1
fayafaya1
08.04.2023
ответ: 3) Другой отв
4,7(50 оценок)
Открыть все ответы
Ответ:
гсооагвгв
гсооагвгв
08.04.2023

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Must Waste More Time...

4,8(58 оценок)
Ответ:
senyacha15
senyacha15
08.04.2023
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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