so sánh
1718+1/1719+1 và1717+1/1718+1
So sánh: A = 17 18 + 1 17 19 + 1 v à B = 17 17 + 1 17 18 + 1
So sánh:
a ) A = 17 18 + 1 17 19 + 1 v à B = 17 17 + 1 17 18 + 1 ; b ) C = 100 100 + 1 100 90 + 1 v à D = 100 99 + 1 100 89 + 1 ;
Điền dấu (>; <; =) thích hợp vào chỗ chấm:
6 5 . . . 4 5 ; 9 13 . . . 9 27 ; 51 49 . . . 1 ; 8 9 . . . 4 3 ; 3 4 . . . 12 16 ; 1 . . . 17 18
Hướng dẫn giải:
Giải thích:
+ vì cùng có mẫu bằng 5, tử số 6 > 4.
+ vì có cùng tử số, mẫu số 13 < 27.
+ vì tử số 51 > mẫu số = 49.
+
+
+ vì tử số bằng 17 < mẫu số bằng 18.
Tìm các số tự nhiên \(a,b\) biết: \(\dfrac{1719}{3976}=\dfrac{1}{2+\dfrac{1}{3+\dfrac{1}{5+\dfrac{1}{a+\dfrac{1}{b}}}}}\)
Lời giải:
\(\frac{1719}{3976}=\frac{1}{2+\frac{538}{1719}}=\frac{1}{2+\frac{1}{3+\frac{105}{538}}}=\frac{1}{2+\frac{1}{3+\frac{1}{5+\frac{13}{105}}}}=\frac{1}{2+\frac{1}{3+\frac{1}{5+\frac{1}{8+\frac{1}{13}}}}}\)
$\Rightarrow a=8; b=13$
\(\dfrac{1719}{3976}=\dfrac{1}{\dfrac{3976}{1719}}=\dfrac{1}{2+\dfrac{538}{1719}}=\dfrac{1}{2+\dfrac{1}{\dfrac{1719}{538}}}=\dfrac{1}{2+\dfrac{1}{3+\dfrac{105}{538}}}\)
\(=\dfrac{1}{2+\dfrac{1}{3+\dfrac{1}{\dfrac{538}{105}}}}=\dfrac{1}{2+\dfrac{1}{3+\dfrac{1}{5+\dfrac{13}{105}}}}=\dfrac{1}{2+\dfrac{1}{3+\dfrac{1}{5+\dfrac{1}{\dfrac{105}{13}}}}}\)
\(=\dfrac{1}{2+\dfrac{1}{3+\dfrac{1}{5+\dfrac{1}{8+\dfrac{1}{13}}}}}\)
1. Read and choose the best option to complete the passage.
One of the first novels in the history of literature was written in England in 1719. It was Robinson Crusoe by Daniel Defoe. Daniel Defoe was born 1……… London in the family of a rich man. When Daniel was a schoolboy, he began to write stories. After 2…………. school, he worked in his father’s shop and wrote articles for newspapers. Defoe visited many countries and met many people. That helped him much in his writings. In 1719, when Defoe was sixty years old, he wrote the novel Robinson Crusoe which 3…………. him famous. Defoe used in his book a true story about a sailor who lived on an island for four years. Robinson Crusoe in Defoe’s novel lived on an island for twenty- eight years. People liked 4…………. novel in England and in many other countries, Daniel Defoe wrote other books. However; his novel Robinson Crusoe was the 5……….. famous. Defoe was not a rich man when he died in 1731.
1. In at from on
2. Going leaving coming staying
3. Brought let did made
4. A X the an
5. Best very most much
1. Read and choose the best option to complete the passage.
One of the first novels in the history of literature was written in England in 1719. It was Robinson Crusoe by Daniel Defoe. Daniel Defoe was born 1……… London in the family of a rich man. When Daniel was a schoolboy, he began to write stories. After 2…………. school, he worked in his father’s shop and wrote articles for newspapers. Defoe visited many countries and met many people. That helped him much in his writings. In 1719, when Defoe was sixty years old, he wrote the novel Robinson Crusoe which 3…………. him famous. Defoe used in his book a true story about a sailor who lived on an island for four years. Robinson Crusoe in Defoe’s novel lived on an island for twenty- eight years. People liked 4…………. novel in England and in many other countries, Daniel Defoe wrote other books. However; his novel Robinson Crusoe was the 5……….. famous. Defoe was not a rich man when he died in 1731.
1. In at from on
2. Going leaving coming staying
3. Brought let did made
4. A X the an
5. Best very most much
One of the first novels in the history of literature was written in England in 1719. It was Robinson Crusoe by Daniel Defoe. Daniel Defoe was born 1……… London in the family of a rich man. When Daniel was a schoolboy, he began to write stories. After 2…………. school, he worked in his father’s shop and wrote articles for newspapers. Defoe visited many countries and met many people. That helped him much in his writings. In 1719, when Defoe was sixty years old, he wrote the novel Robinson Crusoe which 3…………. him famous. Defoe used in his book a true story about a sailor who lived on an island for four years. Robinson Crusoe in Defoe’s novel lived on an island for twenty- eight years. People liked 4…………. novel in England and in many other countries, Daniel Defoe wrote other books. However; his novel Robinson Crusoe was the 5……….. famous. Defoe was not a rich man when he died in 1731.
1. In at from on
2. Going leaving coming staying
3. Brought let did made
4. A X the an
5. Best very most much
1. Read and choose the best option to complete the passage.
One of the first novels in the history of literature was written in England in 1719. It was Robinson Crusoe by Daniel Defoe. Daniel Defoe was born 1……… London in the family of a rich man. When Daniel was a schoolboy, he began to write stories. After 2…………. school, he worked in his father’s shop and wrote articles for newspapers. Defoe visited many countries and met many people. That helped him much in his writings. In 1719, when Defoe was sixty years old, he wrote the novel Robinson Crusoe which 3…………. him famous. Defoe used in his book a true story about a sailor who lived on an island for four years. Robinson Crusoe in Defoe’s novel lived on an island for twenty- eight years. People liked 4…………. novel in England and in many other countries, Daniel Defoe wrote other books. However; his novel Robinson Crusoe was the 5……….. famous. Defoe was not a rich man when he died in 1731.
1. In at from on
2. Going leaving coming staying
3. Brought let did made
4. A X the an
5. Best very most much
So sánh các phân số sau:
1, \(\frac{-17}{-19}\) và \(\frac{1719}{1919}\)
2, \(\frac{189}{1297}\) và \(\frac{317}{1146}\)
Ta có \(\frac{-17}{-19}=\frac{\left(-17\right).\left(-101\right)}{\left(-19\right).\left(-101\right)}=\frac{1717}{1919}\)
mà \(\frac{1717}{1919}
2,\(\frac{189}{1297}\) và \(\frac{317}{1146}\)
Xét phân số trung gian là \(\frac{189}{1146}\) . Ta có:
\(\frac{189}{1297}\)< \(\frac{189}{1146}\)
\(\frac{189}{1146}\)< \(\frac{317}{1146}\)
\(\Rightarrow\)\(\frac{189}{1297}\) < \(\frac{317}{1146}\)(tính chất bắc cầu)
Bài 10. Fill in the blank with a suitable word in the box.
leaving | however | most | was | lived |
made | the | in | much | wrote |
One of the first novels in the history of literature (1) __________ written in England in 1719. It was Robinson Crusoe by Daniel Defoe. Daniel Defoe was born (2) __________ London in the family of a rich man. When Daniel was a schoolboy, be began to write stories. After (3) __________ school, he worked in his father's shop and (4) __________ articles for newspapers. Defoe visited many countries and met many people. That helped him (5) __________ in his writings.
In 1719, when Defoe was sixty years old, he wrote the novel Robinson Crusoe which (6) __________ him famous. Defoe used in his book a true story about a sailor who (7) __________ on an island for four years. Robinson Crusoe in Defoes novel lived on an island for twenty-eight years. People liked (8) __________ novel in England and in many other countries, Daniel Defoe wrote other books. (9) __________ his novel Robison Crusoe was the (10) __________ famous. Defoe was not a rich man when he died in 1731.
1. was
2. in
3. leaving
4. wrote
5. much
6. made
7. lived
8. the
9. However
10. most
1 was
2 in
3 leaving
4 wrote
5 much
6 made
7 lived
8 the
9 However
10 most
Tính A=17/18+1718/1718+171717/181818+...+1717...17/1818...18(2018 chữ số 17 và 18). Ai làm đc tk cho
A=17/18+1718/1718+171717/181818
\(A=\frac{17}{18}+\frac{1717}{1818}+\frac{171717}{181818}+...+\frac{1717..17}{1818...18}\)(2018 số 17 và 18)
\(=\frac{17}{18}+\frac{17.101}{18.101}+\frac{17.10101}{18.10101}+...+\frac{17.1010...01}{18.1010...01}\)(2017 cặp số 10 liên tiếp và dư 1 số 1)
\(=\frac{17}{18}+\frac{17}{18}+\frac{17}{18}+...+\frac{17}{18}\left(2018\text{ số hạng}\right)\)
\(=\frac{17}{18}.2018=\frac{17153}{9}\)
Bài giải
\(A=\frac{17}{18}+\frac{1717}{1818}+\frac{171717}{181818}+\frac{17...17}{18...18}\text{ ( 2018 chữ số17 và 18 ) }\)
\(A=\frac{17}{18}+\frac{17\cdot101}{18\cdot101}+...+\frac{17\cdot1010...1}{18\cdot1010...1}\) ( Có 2017 cặp số 10 và 1 số 1 )
\(A=\frac{17}{18}+\frac{17}{18}+...+\frac{17}{18}\)( Có 1009 số hạng )
\(A=\frac{17}{18}\cdot1009\)
\(A=\frac{17153}{18}\)
Tính: 17 18 - 5 6
A. 1 9
B. 5 9
C. 1 6
D. 1
Fill in the blank with a suitable word in the box.
One of the first novels in the history of literature (1) written in England in 1719. It was Robinson Crusoe by Daniel Defoe. Daniel Defoe was born (2) London in the family of a rich man. When Daniel was a schoolboy, be began to write stories. After (3) school, he worked in his father’s shop and (4) articles for newspapers. Defoe visited many countries and met many people. That helped him (5) in his writings.
In 1719, when Defoe was sixty years old, he wrote the novel Robinson Crusoe which (6) ____ him famous. Defoe used in his book a true story about a sailor who (7)____ on an island for four years. Robinson Crusoe in Defoes novel lived on an island for twenty-eight years. People liked (8) novel in England and in many other countries, Daniel Defoe wrote other books. (9) , his novel Robison Crusoe was the (10) famous. Defoe was not a rich man when he died in 1731.
. Đọc đoạn văn sau và chọn đáp án đúng để trả lời câu hỏi.
There are many kinds of musical instrument and people listen to music all over the world. They turn on music in parties, clubs, weddings and restaurants as well. People like music because it helps them forget sadness and makes them feel more love in life. After a hard working day, people come back home and feel so tired. Music now can help them close their eyes and relax themselves. Sometimes it is difficult to understand music, but people still enjoy it.
Question 1. Do people listen to music all over the world?
A. Yes, they are B. Yes, they do
C. No,they don't D. No, they aren’t
Question 2. Where do they turn on music?
A. in weddings in restaurants
B. in clubs and weddings
C. in parties and clubs
D. in parties, clubs, weddings and restaurants
Question 3. The words “sadness” in line 3 means ______.
A. relax feeling B. funny feeling
C. unhappy feeling D. safe feeling
Question 4. How do people feel after a hard working day?
A. tired B. can close their eyes
C. relax themselves D. easy to sleep
Complete sentences with too or either.
1. We often go to the library on Sunday afternoon, they too.....................
2. Susan can speak Japanese, Tom............................................................
3. Minh didn't see the train, Nga................................................................
4. Hoa will fly to Hong Kong next month, and her mother.........................
5. The pineapples aren’t ripe. And the durians ..........................................
6. March is hot, and May ...........................................................................
7. The boys shouldn’t smoke cigarettes and the girls.................................
8. I don’t know how to use a computer and my friends..............................
9. She likes eggs, and her brothers ............................................................
10. They stayed at home last night, and their children...............................
Viết lại các câu sau sao cho nghĩa không thay đổi so với câu ban đầu, bắt đầu bằng từ gợi ý.
1.“Chèo” or “Cảilương” are considered some kinds of traditional opera in Viet Nam.
Viet Nam has some kinds of_____________________________________________ .
2. My sister sings better than me.
I don’t sing__________________________________________________________ .
3. Ballets and modern dance are quite different.
Ballets and modern dance are not _________________________________________ .
4. The project was shorter than we thought at first.
The project was not as...................................................