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ира1031
05.11.2020 12:27
Математика
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LESSON 2 International Youth Day 1a Work in pairs. Think about International Youth Day.
1) What does IYD mean?
4) Why is IYD important?
2) Who was this holiday organised by? 5) What events can you take part in?
3) How long does this holiday exist? 6) Why is this holiday important?
1b Work in pairs. Read and check your ideas. Look up the new words.
Each August 12, the world celebrates International Youth Day. It is quite
a recent world event - the first IYD was on August 12, 2000. It was
established by the UN (United Nations Organisation). IYD is a chance for
people all around the world to focus on problems of young people.
The theme of IYD 2019 was "Better education"4 Good education is very
important to achieve development and can stop wars and poverty It leads​

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uroolga
uroolga
4,8(39 оценок)

1)f(x) = x²-5x+4

f'(x) = 2x-5

2)2x-5 = 0

2x = 5

x = 2.5

3)

- +

--------[2.5]--------

При x€(-∞; 2.5) функция убывает

При x€[2.5; +∞) - возрастает

f(5/2) = 25/4 - 25/2 + 4 = -25/4 + 4 = -6.25 + 4 = -2.25

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