Предмет: Алгебра, автор: anjekawolf

решить уравнение x^6-3x^3+2=0

Ответы

Автор ответа: Аноним

$x^6-3x^3+2=0$
замена:
$x^3=a \\ \\ a^2-3a+2=0 \\ D=9-8=1 \\ a_1=(3-1)/2=1 \\ a_2=(3+1)/2=2$

$x^3=1 \\ x=1$

$x^3=2 \\ x= \sqrt[3]{2}$

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Read the text. Match paragraphs A–E of the text with questions 1–7. There are two extra questions.

The most dangerous journey
A
How do you feel about car journeys? Do you get a bit bored, ask the driver how long it’s going to take, and then fall asleep? Or do you get extremely anxious? This is exactly how I felt last month, when I took a trip down the most dangerous road in the world.
B
The North Yungas road in Bolivia goes from La Paz, which is a very large city to the town of Coroico in the mountain region of the Amazon rainforest. The road is about 69 km long, but in that short distance it goes down from about 4,650 m high to 1,200 m. Although it is only about three metres wide and there are no guard rails, cars travel in both directions. The views are amazing, but between two and three hundred travellers are killed every year when they drive off the side of this road. In Spanish it is called El Camino de los Muertos – the Road of the Dead.
C
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D
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E
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In which paragraph does the writer tell us ...
(A/B/C/D/E/Not mentioned in any paragraph)(типа варики ответов к каждому вопросу)
about feelings people have when they travel?

how many people die on the road?

about an injury that she had?

about dangerous weather?

how expensive the trip was?

that someone wanted her to see the sights

that she thought she might die?

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