There is a large... of animals that live in Nairobi National Park A various B varied C variety D vary
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YV
21 tháng 2 2019
1 . There is a large varity of animals that live in Nairobi National Park .
đang chờ ý kiến đóng góp
LC
21 tháng 2 2019
\(\sqrt{x^2-2m}+2.\sqrt{x^2-1}=x\ge0\)
đkxd: \(x^2\ge2m,1\)
Ta có: \(\sqrt{x^2-2m}+2.\sqrt{x^2-1}=x< =>\text{}\text{}\text{}2.\sqrt{x^2-1}=x-\sqrt{x^2-2m}\)
=>\(4.\left(x^2-1\right)=\left(x-\sqrt{x^2-2m}\right)^2\)và \(x-\sqrt{x^2-2m}\ge0< =>x\ge\sqrt{x^2-2m}< =>m\ge0\)
<=>\(4x^2-4=x^2-2x.\sqrt{x^2-2m}+x^2-2m\)
<=>\(2x^2+2m-4=-2x.\sqrt{x^2-2m}\)
<=>\(x^2+m-2=-x.\sqrt{x^2-2m}\)
=>\(\left(x^2+m-2\right)^2=\left(-x\sqrt{x^2-2m}\right)^2\)và \(x^2+m-2\ge0\)
<=>\(x^4+2.\left(m-2\right)x^2+\left(m-2\right)^2=x^4-2m.x^2\)
<=>\(\left(4m-4\right)x^2=-\left(m-2\right)^2\)
-xét m=1=>pt<=>0.x^2=-1(vô lí, loại)
-xét m khác 1
=>\(x^2=\frac{-\left(m-2\right)^2}{4m-4}\)
+Với m>1=>\(x^2=\frac{-\left(m-2\right)^2}{4m-4}< 0\)(vô lí, loại)
+Với 0<_m<1=>\(x^2=\frac{-\left(m-2\right)^2}{4m-4}>0< =>\orbr{\begin{cases}x=-\sqrt{\frac{-\left(m-2\right)^2}{4m-4}}\\x=\sqrt{\frac{-\left(m-2\right)^2}{4m-4}}\end{cases}}\)
Theo điều kiện xác định=>x^2>_1,2m và x^2>_2-m
=>\(\hept{\begin{cases}\frac{-\left(m-2\right)^2}{4m-4}\ge1\\\frac{-\left(m-2\right)^2}{4m-4}\ge2m\end{cases}and\frac{-\left(m-2\right)^2}{4m-4}\ge2-m}< =>\hept{\begin{cases}\frac{\left(m-2\right)^2}{4-4m}\ge1\\\frac{\left(m-2\right)^2}{4-4m}\ge2m\end{cases}and\frac{\left(m-2\right)^2}{4-4m}\ge2-m}\)Vì 4-4m>0=>\(\hept{\begin{cases}\left(m-2\right)^2\ge4-4m\\\left(m-2\right)^2\ge2m\left(4-4m\right)\end{cases}and\left(m-2\right)^2\ge\left(4-4m\right)\left(2-m\right)< =>\hept{\begin{cases}m^2\ge0\\\left(3m-2\right)^2\ge0\end{cases}}}\)và 2/3<_m<_2
Do đó để pt có nghiệm thì 2/3<_m<1
LT
21 tháng 3 2022
VI. Provide the correct form of the words in capital letters to complete the sentences.
26. There is a large ______variety____ of animals that live in Cuc Phuong National Park. (VARY)
27. Artists are ____creative______ people (CREATE).
28. He works as a ____mechanic______ in this factory. (MACHINE)
29. Reading funny stories is an _______enjoyable___ way to relax. (ENJOY) 30. The newspaper is a means of _______communication________ (COMMUNICATE)
NB
5 tháng 6 2023
Question 26: There is a large variety of animals that live in Cuc Phuong National Park.
Question 27: Artists are creative people.
Question 28: He works as a machinist in this factory.
Question 29: Reading funny stories is an enjoyable way to relax.
Question 30: The newspaper is a means of communication.
H
25 tháng 4 2019
1. He apologized for the (convenient)_inconvenience___ he had caused.
2. For your (inform)_information__, the library is on the third floor.
3. This is one of the best (document) _documentary___films showing the lives of working people.
4. The government has introduced some (effect)_effections__ measures to reduce unemployment.
5. He is a (curiosity)_curious__boy. He is always asking questions.
6. There is a large __variety__ of animals that live in Nairobi National Park. (vary)
7. We can't clean up our__polluteed_ rivers and seas. (pollute)
8. The earth is being_threatened__ and the future looks bad. (threat)
9. His__survival_ is still uncertain;he has been seriously injured. (survive)
28 tháng 4 2017
-
Yesterday she heard ________ news. She was so ________ that she couldn’t say anything.
A. surprised/ surprising B. surprised/ surprised C. surprising/ surprising D. surprising/ surprised
-
________ have you stayed there? – I’ve spent three wonderful weeks there.
A. How often B. How much C. How long D. How far
-
She has saved a sum of money for her ________.
A. retiring B. retired C. retirement D. retire
-
Which do you prefer. Action films ________ love stories?
A. with B. or C. and D. but
-
My home village is ________ 40 kilometres north of the capital.
A. held B. laid C. surrounded D. located
-
The World Cup is considered the most popular sporting event in the world.
A. witnessed B. regarded C. organized D. competed
-
There is a large ________ of animals that live in Nairobi National Park.
A. various B. vary C. varied D. variety
-
The film opened with a ________ in an apartment and some policemen were examining a body.
A. look B. rest C. shock D. scene
-
Carnivores are animals which ________.
A. eat plants B. eat meat C. live on the bottom D. swim very fast
-
They have just bought some paint. They ________ their house this afternoon.
A. are going to paint B. will paint C. to painting D. be going to paint
-
If I ________ you, I wouldn’t buy that coat.
A. am B. was C. were D. would be
-
________ is traditional music of a country.
A. Pop music B. Jazz C. Folk music D. Classical music
-
Water ________ most of the earth’s surface.
A. covers B. is covered C. being covered D. is covering
-
Cuc Phuong National Park ________ over 200 square kms of rainforest.
A. holds B. covers C. contains D. gets
-
Peter has practiced playing the piano ________ the piano contest next week.
A. to enter B. to entering C. in order enter D. to not enter
-
Henry ________ a rich man if he had been more careful in the past.
A. would have been B. will be C. would be D. was
-
I wonder where Mai is. She should ________ here by now.
A. be B. is C. to be D. being
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The tickets ________ to you over a week ago.
A. will be sold B. are sold C. were sold D. have been sold
-
Without plants, most water would ________ as soon as it falls.
A. run off B. run after C. run away D. run by
L
4 tháng 12 2019
it ___ that the road through the national park will not affect the environment and living habitat of wild animals there
A. has thought B. had been thought C. is thought D. thinks
~~Study Well~~
There is a large... of animals that live in Nairobi National Park A various B varied C variety D vary
There is a large... of animals that live in Nairobi National Park A various B varied C variety D vary