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макс3095
макс3095
29.09.2022 12:08 •  Алгебра

Укажите решение неравенства -3-3x<=7x-9

👇
Ответ:
kriskuziya0708
kriskuziya0708
29.09.2022

всё подробно решено на фото


Укажите решение неравенства -3-3x<=7x-9
4,4(97 оценок)
Ответ:
Makalllla1122
Makalllla1122
29.09.2022

x\geq \frac{3}{5}

Объяснение:

Решение на рисунке


Укажите решение неравенства -3-3x<=7x-9
4,5(52 оценок)
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Ответ:
гсооагвгв
гсооагвгв
29.09.2022

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Must Waste More Time...

4,8(58 оценок)
Ответ:
Zein304
Zein304
29.09.2022

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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