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vigura2
vigura2
17.10.2020 12:16 •  Алгебра

Представьте ввиде произведения: а)14х+21у; б)15а+10б: и)7х-14хв 3степени

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Ответ:
solomijahladij6
solomijahladij6
17.10.2020

Представьте ввиде произведения: а)14х+21у=7(2х+3у)

б)15а+10б=5(3а+2б)

и)7х-14хв 3степени=7х(1-2х^2)

4,5(44 оценок)
Ответ:
kristinakalash
kristinakalash
17.10.2020

a)14x+21y=7(2x+3y)

b)15a+10b=5(3a+2b)

c)7x-14x=7х(1-2х^2)

4,8(71 оценок)
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Ответ:
гсооагвгв
гсооагвгв
17.10.2020

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Must Waste More Time...

4,8(58 оценок)
Ответ:
Zein304
Zein304
17.10.2020

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

4,5(21 оценок)
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