t uch
Những câu hỏi liên quan
Tiêuchí
đất ferralit
đất phù sa
đất mùn núi cao
Diện tích
Đặc điểm
Phân bố
gía trị sử dụng
Làm hộ bảng này ạ
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|
Tiêuchí |
đất ferralit | đất phù sa | đất mùn núi cao |
|
Diện tích |
|||
| Đặc điểm | |||
| Phân bố |
|
gía trị sử dụng
Làm hộ bảng này ạ
|
Tiêu chí |
đất ferralit | đất phù sa | đất mùn núi cao |
|
Diện tích |
chiếm 65% diện tích đất tự nhiên | chiếm 24% diện tích đất tự nhiên | chiếm 11% diện tích đất tự nhiên |
| Đặc điểm | chua, ghèo mùn, nhiều sét, màu vàng, đỏ | phì nhiêu, màu mỡ, ít chua, tơi xốp | giàu mùn, tích tụ nhiều oxit nhôm |
| Phân bố |
vùng đồi núi thấp, Đông Nam Bộ và Tây Nguyên |
vùng đồng bằng, ven biển | trên núi cao |
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Find the word with different sound in the underline part in each line
1. A. game B. famous C. distance D. grape
2. A. founded B. repaired C. filled D. loved
3. A. sugar B. such C. spring D. similar
4. A. festival B. together C. elephant D. telephone
1. A. game B. famous C. distance D. grape
2. A. founded B. repaired C. filled D. loved
3. A. sugar B. such C. spring D. similar
4. A. festival B. together C. elephant D. telephone
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Cho góc xAy trên tia Ax lấy 2 điểm B và C sao cho AB =8cm , Ác =15cm trên tia Ay lấy 2 điểm D và E sao cho AD =10cm AE=12cm
a) cm tam giác ABE đồng dạng với tam giác ADC
b) AB.DC=AD.BE
c)tính ĐC biết BE=10cm
d) gọi I là giao điểm của BE và ĐC cm ÌE.IB=ID.IC
Xét tam giác \(ABE\) \(\&ADC\)
\(BAE=ADC\)(góc chung)
\(\frac{AB}{CD}=\frac{8}{10}=\frac{4}{5};\frac{AE}{AC}=\frac{12}{15}=\frac{4}{5}\)
\(\Rightarrow tamgiácABE~tamgiacADC\left(C.G.C\right)\)
b) Từ tam giác \(ABE\) \(~\)tam giác \(ADC\)\(\Rightarrow\frac{AB}{CD}=\frac{BE}{DC}\Rightarrow DC=\frac{AD\cdot BE}{AB}=\frac{10\cdot10}{8}=12,5\)
c) Từ tam giác \(ABE~\)tam giác \(ADC\left(cmt\right)\)
\(\Rightarrow\frac{S_{ABE}}{S_{ADC}}=\left(\frac{AB}{AD}\right)^2=\left(\frac{8}{10}\right)^2\left(\frac{4}{5}\right)^2=\frac{16}{25}\)
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Complete the following text by writing ONE suitable preposition in each gap.
Cotton was cultivated in pakistan about 3,000 BC. It was also grown in Central America. Later it was also grown _____ Iraq and Egypt. The Industrial Revolution made cotton uch cheaper. In 1771 Richard Arkwright opened a cotton-spinning mill with a machine called a water frame, which was powered_____ a water mill. Then, in 1779, Samuel Crompton invented a new cotton-spinning machine called a spinning mule. Finall...
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Complete the following text by writing ONE suitable preposition in each gap.
Cotton was cultivated in pakistan about 3,000 BC. It was also grown in Central America. Later it was also grown _____ Iraq and Egypt. The Industrial Revolution made cotton uch cheaper. In 1771 Richard Arkwright opened a cotton-spinning mill with a machine called a water frame, which was powered_____ a water mill. Then, in 1779, Samuel Crompton invented a new cotton-spinning machine called a spinning mule. Finally, in 1785 Edmund Cartwright invented a loom that could be powered by a steam engine. In 1794 American Eli Whitney patented the cotton gin. As a result_____ these new inventions cotton production boomed.
In 1884 Count Hilaire de Chardonnet made the first artificial fibre, from plant cellulose. In the following chemists invented new ways of making fibres_____ cellulose and by the 1920s they were common. The name rayon was invented in 1924.
Nylon was first made in 1935 by Wallace Carothers. Nylon stockings went_____ sale in 1940. Terylene was invented by British scientist John Rex Whinfield and James Tennant Dickson in 1941. Spandex was invented by Joseph Shivers in 1958. It was first manufactured in 1962
Complete the following text by writing ONE suitable preposition in each gap.
Cotton was cultivated in pakistan about 3,000 BC. It was also grown in Central America. Later it was also grown _on_ Iraq and Egypt. The Industrial Revolution made cotton uch cheaper. In 1771 Richard Arkwright opened a cotton-spinning mill with a machine called a water frame, which was powered__from___ a water mill. Then, in 1779, Samuel Crompton invented a new cotton-spinning machine called a spinning mule. Finally, in 1785 Edmund Cartwright invented a loom that could be powered by a steam engine. In 1794 American Eli Whitney patented the cotton gin. As a result__from_ these new inventions cotton production boomed.
In 1884 Count Hilaire de Chardonnet made the first artificial fibre, from plant cellulose. In the following chemists invented new ways of making fibres__for___ cellulose and by the 1920s they were common. The name rayon was invented in 1924.
Nylon was first made in 1935 by Wallace Carothers. Nylon stockings went__off sale in 1940. Terylene was invented by British scientist John Rex Whinfield and James Tennant Dickson in 1941. Spandex was invented by Joseph Shivers in 1958. It was first manufactured in 1962
in / by / of / from / on
Bài 1:aI can see a lot of .................... getting off other planes.bMy mum is reading a ...................... to check the weather.Bài 2:Much or many 1............. luggage 4..............peace 7................music 10..................chairs 2..............love 5...............hands 8..................sense 11..................plates3.....
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Bài 1:
a>I can see a lot of .................... getting off other planes.
b>My mum is reading a ...................... to check the weather.
Bài 2:
Much or many
1............. luggage 4..............peace 7................music 10..................chairs
2..............love 5...............hands 8..................sense 11..................plates
3..............printers 6................cheese 9...................ideas 12..................traffic
13............evenings 14...............picture 15.................stars
cho dang dung cua dongtu theo dang 1.my mother never makes me (work).......... hard 2.you have to (finish).............all the homework before going to bed 3,must we(wash)............our hands before meat? 4.let him (do)...........what he wants 5.i often have my mother(wash)...........the clothes everyday 6.will you please(pass)........me some salt?-here you are 7.its very hot now.i want(hve)..............a cold drink 8.would you like (come).........to my house for dinner tonight? 9.my mother to...
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cho dang dung cua dongtu theo dang 1.my mother never makes me (work).......... hard 2.you have to (finish).............all the homework before going to bed 3,must we(wash)............our hands before meat? 4.let him (do)...........what he wants 5.i often have my mother(wash)...........the clothes everyday 6.will you please(pass)........me some salt?->here you are 7.it's very hot now.i want(hve)..............a cold drink 8.would you like (come).........to my house for dinner tonight? 9.my mother told me(turn)............off the lights be fore going out 10.i asked her(not eat)............too uch meat because she is overweight 11.i often takes me 20 minutes(go)..........to school every morning 12.i often spend my free time(play)...........soccer 13.the woman(stand)............over there is my new teacher 14.the boy prefers(read).............comics to (play).........vides game 15.the boy (read)..............a book is Ba 16.do you know the girl (talk)............to the teacher over there? 17.the lamp(make).............in china is 5 dollars 18.the car toy(sell)............in this shop are made in china 19.i like reading the book(write)...............by Shakepeare 20.have you ever seen the movie(show).................on TV last night 21.do you like the gift (give)..............on your last birthday? có cả giải thích nữa cần gấp lắm
II.Choose one word whose underlined part is pronounced differently from the others in each following line.
1.A. talked B. visited C. rented D. fitted
2.A. help B. friend C. send D. fewer
3.A. stamp B. sew C. opposite D. bookstore
4.A. milk B. library C. dinner D. polish
5.A. pork B. go C. hold D. cold
VI.Put the questions for the underline words:
1. My brother plays video g...
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II.Choose one word whose underlined part is pronounced differently from the others in each following line.
1.A. talked B. visited C. rented D. fitted
2.A. help B. friend C. send D. fewer
3.A. stamp B. sew C. opposite D. bookstore
4.A. milk B. library C. dinner D. polish
5.A. pork B. go C. hold D. cold
VI.Put the questions for the underline words:
1. My brother plays video games twice a week.
->....................................................................
2. We rarely eat out because it is far too expensive.
->...............................................................................
3. Minh usually spends one hour on computer games.
->.............................................................................
4. Her son is going to invent a new game.
->.........................................................................
5. They were in the library last night.
............................................................................................
V. Choose the incorrect words underlined (A,B,C or D ) and correct them.
25. We didn't wanted to go to the park because it was raining heavily
A B C D
26. Mary didn't buy any books because the bookshop closed ten minute ago.
A B C D
27. We never likes living in a big city because it is too noisy.
A B C D
28. I can't speak Chinese and neither can't my brother.
A B C D
29. I want to buy a few sugar.
A B C D
V. Prepositions:
1. The students like to take part ______ outdoors activities.
People watched TV___the window.
Hoa sets the table______plates,bowls,chopsticks, spoons and glasses.
I. Circle the word that has the underlined part pronounced differently from the others.
1.A. decide B. type C. improve D. smile
2.A. iron B.drill C. fill D.gifl
3.A.dust B.touch C. stomach D. normal
44.A. amusement B.durian C.cucumber D. scuba-diving.
Hồ Bảo Trâm cj iu ưi, ráng giúp e nhoa :333 iu cj <333
II.Choose one word whose underlined part is pronounced differently from the others in each following line.
1.A. talked B. visited C. rented D. fitted
2.A. help B. friend C. send D. fewer
3.A. stamp B. sew C. opposite D. bookstore
4.A. milk B. library C. dinner D. polish
5.A. pork B. go C. hold D. cold
VI.Put the questions for the underline words:
1. My brother plays video games twice a week.
->..........................how often does your brother play video games? ..........................................
2. We rarely eat out because it is far too expensive.
->......................................Why do you rarely eat out?.........................................
3. Minh usually spends one hour on computer games.
->..............................How much time does Minh usually spend on computer games...............................................
4. Her son is going to invent a new game.
->....................................What is her son going to invent?.....................................
5. They were in the library last night.
..........................................Where were they last night?..................................................
V. Choose the incorrect words underlined (A,B,C or D ) and correct them.
25. We didn't wanted -> want to go to the park because it was raining heavily
A B C D
26. Mary didn't buy any books because the bookshop closed ten minute -> minutes ago.
A B C D
27. We never likes -> like living in a big city because it is too noisy.
A B C D
28. I can't speak Chinese and neither can't -> can my brother.
A B C D
29. I want to buy a few -> little sugar.
A B C D
V. Prepositions:
1. The students like to take part ___in___ outdoors activities.
People watched TV_through__the window.
Hoa sets the table___with___plates,bowls,chopsticks, spoons and glasses.
I. Circle the word that has the underlined part pronounced differently from the others.
1.A. decide B. type C. improve D. smile
2.A. iron B.drill C. fill D.gifl
3.A.dust B.touch C. stomach D. normal
44.A. amusement B.durian C.cucumber D. scuba-diving.
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Viết mạch bổ sung cho đoạn mạch AND sau:-A-T-A-G-X-A-T-G-T-T-A-X-G-X
A.-A-T-A-G-X-A-T-G-T-T-A-X-G-X-
B. -T-A-T-X-X-T-A-X-X-A-T-G-X-G-
C.-T-A-T-X-G-T-A-X-T-T-T-G-X-G-.
D. -T-A-T-X-G-T-A-X-A-A-T-G-X-G-
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Đặt √x t, x ≥ 0 t ≥ 0.Vế trái trở thành: t8 – t5 + t2 – t + 1 f(t)Nếu t 0, t 1, f(t) 1 0Với 0 t 1, f(t) t8 + (t2 - t5)+1 - t t8 0, 1 - t 0, t2 - t5 t3(1 – t) 0. Suy ra f(t) 0.Với t 1 thì f(t) t5(t3 – 1) + t(t - 1) + 1 0Vậy f(t) 0 ∀t ≥ 0. Suy ra: x4 - √x5 + x - √x + 1 0, ∀x ≥ 0. mọi người giải thích hộ mình chỗ này nhé: t2 - t5 t3(1 – t) 0
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Đặt √x = t, x ≥ 0 => t ≥ 0.
Vế trái trở thành: t8 – t5 + t2 – t + 1 = f(t)
Nếu t = 0, t = 1, f(t) = 1 >0
Với 0 < t <1, f(t) = t8 + (t2 - t5)+1 - t
t8 > 0, 1 - t > 0, t2 - t5 = t3(1 – t) > 0. Suy ra f(t) > 0.
Với t > 1 thì f(t) = t5(t3 – 1) + t(t - 1) + 1 > 0
Vậy f(t) > 0 ∀t ≥ 0. Suy ra: x4 - √x5 + x - √x + 1 > 0, ∀x ≥ 0.
mọi người giải thích hộ mình chỗ này nhé: t2 - t5 = t3(1 – t) > 0
Bài giải đã giải thích rồi mà......Với 0<t<1 =>\(\left\{\begin{matrix}t^3>0\\1-t>0\end{matrix}\right.\) tích hai số dương => phải dương
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