Ответы 1
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Sin²x-11sinx+10=0
Sin²x=a
a²-11a+10=0
Δ=81
√Δ=9
a1=(11-9)/2=2/2=1
a2=(11+9)2=20/2=20 не подходит sinx ∈ <-1;1>
sinx=1
x=π/2+2kπ k e C
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Автор:
hopkins - 5 лет назад
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0
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Answer the questions:
1. Why is a child’s birthday a very special day?
2. What do the children do at a party?
3. What tasty things are they treated to?
4. Why don’t the children open the presents at the beginning of the party?
5. Do you think it is a good idea to give gifts to the guests?
6. Compare a birthday party in your country and in England.
7. What are the most popular games played at birthday parties?
When your birthday comes round it is a very special day. Some
English children have a party at home on this day. They invite their
friends and family to the party. Many presents are given to the birthday
boy or girl. Usually the guests arrive and play some games or watch
videos.After some time the lights are turned off and one of the parents brings
out the birthday cake. It has the number of candles on it to match the
boy’s or girl’s age plus one more for good luck. All the guests sing the
Happy Birthday song. After the song the birthday boy or girl makes a
wish and blows all the candles out. The parents get him to cut the cake
and everyone eats a piece. There is also ice-cream and candy.
Next comes opening the birthday cards and presents. The boy or girl
opens each present and card in front of all the guests. They pass the
presents and cards around so that everyone can see what they are. The
boy or girl says “thank you” to each person who gave him or her a gift
and card. The children play more games and watch more videos. At some
parties the guests are given a party favour or gift to take home. It usually
is a happy time for everyone.-
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mallory - 5 лет назад
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ПОМОГИТЕ ПОЖАЛУЙСТА!!
Сколько корней имеет уравнение −x^2=x−1 ?
(Если один корень, то поставь «1», если два решения, то «2», если не имеет решения, то « - »)
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