Andreeva
?>

1. Найдите степень уравнения: 1) ху - 3x - 0;2) 3х - ху - 5;3) (2x- y) + ' - 5 - 0; А) -1 +ух х - 7, 5) ху? + xу - 4;6) (x-3y) + х - 9.​

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Lomakina-Valerievna1779

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Must Waste More Time...

myatadinamo

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

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1. Найдите степень уравнения: 1) ху - 3x - 0;2) 3х - ху - 5;3) (2x- y) + ' - 5 - 0; А) -1 +ух х - 7, 5) ху? + xу - 4;6) (x-3y) + х - 9.​
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