3 phần 2 x^2+x+1. Help me. Mk sắp thi rồi giúp vs
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23 tháng 4 2018
F(x)=x2-x-x+2
➝F(x)=x2-x-x+1+1
F(x)=x(x-1)-(x-1)+1
F(x)=(x-1).(x-1)+1
F(x)=(x-1)2+1
Có +(x-1)2\(\ge\forall\) x
+1>0
\(\Rightarrow\)f(x) =(x-1)2+1>0
Vậy f(x) vô n0
Chúc bạn học tốt nha!!!
25 tháng 5 2018
Đề 1
I. PHONETICS: Choose the word that has the underlined part pronounced differently from the rest. (1,5pt)
|
1. A. camp |
B. plan |
C. plane |
D. badminton |
|
2. A. sky |
B. thirsty |
C. hungry |
D. finally |
|
3. A. ride |
B. night |
C. river |
D. tired |
|
4. A. window |
B. flow |
C. how |
D. know |
|
5. A. engineer |
B. geography |
C. language |
D. great |
|
6. A. lettuce |
B. tube |
C. music |
D. use |
II. GRAMMAR AND VOCABULARY
Circle the letter A, B, C or D as your best choice to complete each sentence. (2pts)
1. My sister is a nurse. She works in the.........
A. hospital B. factory C. farm D. School
2. They.............. not buy books.
A. are B. do C. does D. am
3. How much _________do you want?
A. eggs B. tea C. oranges D. apples
4. How __________ do you go jogging? - Once a day.
A. usually B. often C. never D. always
5. There is __________bread on the table.
A. a B. an C. some D. two
6. I like _________. I have a rope.
A. skip B. skips C. skiping D. skipping
7. __________________go to Da Lat?
A. Let's B. Why don't we C. What about D. How about
8. I like fruit. I like _____________very much.
A. carrots B. tomatoes C. peas D. apples
Give the correct verb forms or tenses. (1,5 pt)
1. My school (have)........................two floors.
2 She (drink)...........................a lot of juice every day.
->...................................................................................................
3. Lan and Nga (see)....................................a new film next week.
->...................................................................................................
4. What about (visit).........................................our parents?
5. He (ride).................his bicycle every day. He (ride)..................his bicycle now
->...................................................................................................
III. READING: Read the following passage and then do the tasks that follow. (2pts)
South Vietnam enjoys a tropical climate, so there are two seasons all year round. They are known as the dry season and the rainy season. It's very hot in the dry season, but it's cool in the rainy season. In the dry season, we often go camping and swimming. In the rainy season we don't often go out. We sometimes go fishing in the morning because it often rains in the afternoon.
A. Tick True or False.
|
FACTS |
T |
F |
|
|
1. |
There are two seasons in the south of Vietnam. |
|
|
|
2. |
It’s very cold in the dry season. |
|
|
|
3. |
They often go camping and swimming. |
|
|
|
4. |
in the rainy season, it often rains in the afternoon. |
|
B. Answer the following sentences. (1pt)
1. How many seasons are there in South Vietnam?
................................................................................................................
2. What do they do in the rainy season?
................................................................................................................
3. Is it cool in the dry season?
...............................................................................................................
4. Why do they go fishing in the morning?
....................................................................................................................
IV. WRITING:
Write complete sentences using the suggested words. (2pts)
1. Ba/ always/ walk/ school.
......................................................................................................................
2. The Mekong River/ long/ than/ the Red River.
.....................................................................................................................?
3. Ho Chi Minh City/ large/ than/ Hanoi.
......................................................................................................................
4. How/ rice/ and/ many/ vegetables/ he/ produce?
......................................................................................................................
Đề 2
SECTION I: PHONETICS (1pt)
1. A. lamp B. table C. family D. plan
2. A. skip B. swim C. fried D. milk
3. A. hungry B. sky C. healthy D. thirsty
4. A. books B erasers C. rulers D. bags
SECTION II: VOCABULARY, GRAMMAR AND STRUCTURES
Part 1: Choose the best answer (2,5pts)
1. How............... kilos of beef does she want?
A. many B. much C. often D. about
2. His father is waiting................ a bus.
A. to B. for C. of D. at
3. We go there by car and they go......... foot.
A. on B. by C. to D. with
4. Listen! Who......... to your sister?
A. is going to talk B. talks C. does talk D. is talking
5. Fall means......... in British English.
A. summer B. winter C. spring D. autumn
6. Tokyo is.............. than Mexico City.
A. smaller B. smallest C. the smallest D. small
7. I don't have......... apples but I have...............oranges.
A. any/ some B. any/ any C. some/ any D. some/ some
8. What color................her eyes?
A. is B. are C. do D. does
9...................... is a pen?. It is 5,000 dong.
A. How many B. How C. How often D. How much
10. She isn't strong. She is...............
A. weak B. tall C. short D. heavy
Part 2: Supply the correct form of verbs: (1,5pts)
1. I (write).........to my parents now, I (write)....... to them every weekend.
2. You (go).................to the party tonight?
3. Mary (listen)................to music at the moment.
4. He (want)................(be).............a doctor.
SECTION III: SPEAKING
Match the question in column A with the right answer in column B. (1pt)
|
A |
B |
|
1. What weather does she like? 2. How often do you go shopping? 3. How do you go to school? 4. Why don’t we go to the beach? |
a. I walk to school. b. Good idea. c. Once a week. d. She likes warm weather. |
|
1…………… 2………………….. |
3………………… 4………………… |
SECTION IV: READING (2pts)
Read the text and decide if these statements are True (T) or False (F)
My uncle is an engineer. His name is Hung. He is going on vacation this summer. First, he is going to visit Ha Long Bay. He is going to stay in a small hotel near the bay for two days. Then he is going to visit Da Lat for three days. Finally, he is going to visit some friends in Ho Chi Minh City. He is going to stay there for one day. He is going to walk along Saigon River. He is going to fly home.
True(T)/ False(F) statements:
1....... Mr. Hung is going to visit three cities this summer.
2.......He is going to visit Ha Long Bay first, then Ho Chi Minh City, and finally Da Lat.
3.......He is going to stay in Da Lat for three days.
4........He is going to go home by train.
SECTION V: WRITING (2pts)
Arrange the words into the sentence:
1. want/ Tom/ Mary/ and/ glasses/ two/ of/ water.
.....................................................................................................................................
2. sister/ my/ going/ is/ to/ live/ country/ the/ in.
.....................................................................................................................................
3. the/ spring/ in/ what/ weather/ is/ like/ the?
....................................................................................................................................
4. building/ tallest/ the/ is/ this/ the/ in/ world.
.....................................................................................................................................
24 tháng 12 2018
Cho \(x=\frac{1}{4}\Rightarrow2.f\left(\frac{1}{\frac{1}{4}}\right)=\left(\frac{1}{4}\right)^2\)
\(\Rightarrow2f\left(4\right)=\frac{1}{16}\Rightarrow f\left(4\right)=\frac{1}{32}\)
TT
1
8 tháng 5 2021
$ĐKXĐ : x \neq 2, x \neq -2$
Ta có : $1+\dfrac{2}{x-2} = \dfrac{2x^2}{x^2-4}$
$\to \dfrac{x^2-4+2.(x+2)}{(x-2).(x+2)} = \dfrac{2x^2}{(x-2).(x+2)}$
$\to x^2-4+2.(x+2) = 2x^2$
$\to x^2 -2x - 8 = 0 $
$\to (x-4).(x+2) = 0 $
$\to x = 4$ ( Do $x \neq -2, 2$ )
Vậy \(S=\left\{4\right\}\)
17 tháng 12 2017
1.
My favourite leisure activity is reading. I like reading because it is a hobby that is useful and interesting: useful because you can find a lot of knowledge of all areas that you need; interesting because the books can give you the joy and help you relax after a day of toil etc... Especially, when you join the forum, you can meet a lot of people who have interests similar to yours, comment on the books or novels that interest you.
I love books and also natural as reading books. At the age of ten, I was awarded "The Scarlet Sails" of Alexandre Green by my grandfather. It is the first of book that I have been. I read it does not know how many times (Up to now, I still love it and occasionally read it again). My love for books begun.
I usually spend almost of free time in choosing the book with my friends, participate in dicussion on the forum and reading (of course!). Every weekend and all holidays when I have no work to do, I often read books and ruminate on it. I also help some friends can select the genres of books that they like.
I always hope that I will have my own library in my future. I love books very much and perhaps, I couldn't live without them.
17 tháng 12 2017
2.
In my opinion, life in the city as well as in the countryside has its own benefits. Personally, I prefer living in the countryside.
In the first place, life in the the countryside is much more peaceful in the way that it gives people a chance to relax and feel at ease.
Secondly, the air is so fresh and pure in the countryside. Besides, there are so many beautiful sceneries there such as woods, mountains, rivers, ponds and lakes... For that reason, many people choose the countryside as their refreshment site after tiring days at work. Moreover, rural people are very friendly and hospitable. You are always welcome to their place. They make a living by farming and breeding cattle and poultry. The food there is always fresh and delicious.
Lastly, life in the conutryside is very peaceful and good for our heath.
If someone asks where I would rather live, my definite answer is the peaceful and happy countryide.
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