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1. Tim's father has more vacations than Hoa's father. (FEWER) ............................................................................................................... 2. Why don't we go to the cafeteria? (ABOUT) ............................................................................................................... 3. Mai drinks more milk than her brother. (LESS) =>.................................................................................................. 4. The blue...
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1. Tim's father has more vacations than Hoa's father. (FEWER) ...............................................................................................................

2. Why don't we go to the cafeteria? (ABOUT) ...............................................................................................................

3. Mai drinks more milk than her brother. (LESS) =>..................................................................................................

4. The blue hat is more expensive than the yellow one. (CHEAPER) ..............................................................................................................

5. We will have a vacation that lasts for three months. (THREE MONTHS) .................................................................................................................

6. Nam will visit his grandparents tonight. (GOING) .....................................................................................................................................

7. My mother likes walking better than cycling. (prefers) ...............................................................................................................

8. Why don't we go to the movies this weekend? (ABOUT) ................................................................................................

9. They like to travel to Nha Trang on their vacation. (ENJOY) ................................................................................................

10. Let's see a detective film. (HOW) ................................................................................................

11. Reading is more boring than watching TV. (INTERESTING) ................................................................................................

12. We will make a Sapa tour that lasts four days. (FOUR DAY) .........................................................................................................

13. My father is a careful driver. à (DRIVES) ...................................................................................

14. She gave me a note that worths fifty dollars. (DOLLAR) ..............................................................................

15. Hoa hates the noise and the busy roads in the city. (LIKE) ................................................................................................

16. I like video games better than computer games. (TO) ................................................................................................

17. Let's go to the amusement center. (don't .............................................................................................?

18. You should wash your hands before meals. (OUGHT) .....................................................................................................................

19. Children like picture books very much. (IN) ................................................................................................................

20. Michael Jordan is a skillful basketball player. (PLAYS) ............................................................................................................

3
13 tháng 7 2017

1. Tim's father has more vacations than Hoa's father. (FEWER)

Hoa's father has fewer vaactions than Tim's father

2. Why don't we go to the cafeteria? (ABOUT)

what about going to the cafeteria?

3. Mai drinks more milk than her brother. (LESS)

=>. Mai's brother drinks less milk than her

4. The blue hat is more expensive than the yellow one. (CHEAPER)

the yellow hat is cheaper than the blue one

5. We will have a vacation that lasts for three months. (THREE MONTHS)

We will have a three-month vacation

6. Nam will visit his grandparents tonight. (GOING) ..

Nam is going to visit his grandparents tonight

7. My mother likes walking better than cycling. (prefers) .

My mother prefers walking to cycling

8. Why don't we go to the movies this weekend? (ABOUT)

what about going to the movies this weekend?

9. They like to travel to Nha Trang on their vacation. (ENJOY)

They enjoy traveling to Nha Trang on their vacation

10. Let's see a detective film. (HOW)

how about seeing a detective film?

11. Reading is more boring than watching TV. (INTERESTING)

watching TV is more interesting than reading

12. We will make a Sapa tour that lasts four days. (FOUR DAY)

We will make a four-day tour to Sapa

13. My father is a careful driver. à (DRIVES)

my father drives carefully

14. She gave me a note that worths fifty dollars. (DOLLAR)

She gave me a fifty-dollar note

15. Hoa hates the noise and the busy roads in the city. (LIKE)

Hoa doesn't like the noise and the busy roads in the city

16. I like video games better than computer games. (TO)

i prefer video games to computer games..

17. Let's go to the amusement center. (don't

why don't we go to the amusement center?

18. You should wash your hands before meals. (OUGHT) .

you ought to wash your hands before meals

19. Children like picture books very much. (IN)

children are interested in picture books very much

20. Michael Jordan is a skillful basketball player. (PLAYS)

Michael Jordan plays basketball skillfully

13 tháng 7 2017

1. Tim's father has more vacations than Hoa's father. (FEWER)

Hoa's father has fewer vacations than Tim's father.

2. Why don't we go to the cafeteria? (ABOUT)

What about going to the cafeteria?

3. Mai drinks more milk than her brother. (LESS)

=> Mai's brother drinks less milk than her.

4. The blue hat is more expensive than the yellow one. (CHEAPER)

-> The yellow hat is cheaper than the blue one.

5. We will have a vacation that lasts for three months. (THREE MONTHS)

We will have a three-month vacation.

6. Nam will visit his grandparents tonight. (GOING)

Nam is going to visit his grandparents tonight.

7. My mother likes walking better than cycling. (prefers)

My mother prefers walking to cycling.

8. Why don't we go to the movies this weekend? (ABOUT)

What about going to the movies this weekend?

9. They like to travel to Nha Trang on their vacation. (ENJOY)

They enjoy travelling to Nha Trang on their vacation.

10. Let's see a detective film. (HOW)

How about seeing a detective film?

11. Reading is more boring than watching TV. (INTERESTING)

Watching TV is more interesting than reading.

12. We will make a Sapa tour that lasts four days. (FOUR DAY)

We will make a four-day Sapa tour.

13. My father is a careful driver. à (DRIVES)

My father drives very carefully.

14. She gave me a note that worths fifty dollars. (DOLLAR)

She gave me a fifty-dollar note.

15. Hoa hates the noise and the busy roads in the city. (LIKE)

Hoa doesn't like the noise and the busy roads in the city.

16. I like video games better than computer games. (TO)

I prefer video games to computer games.

17. Let's go to the amusement center. (don't

Why don't we go to the amusement center?

18. You should wash your hands before meals. (OUGHT)

You ought to wash your hands before meals.

19. Children like picture books very much. (IN)

Children are very interested in picture books.

20. Michael Jordan is a skillful basketball player. (PLAYS)

Michael Jordan plays basketball skillfully.

4 tháng 4 2022

bn có giải đc ko?

4 tháng 4 2022

d. Áp dụng BĐT Caushy Schwartz ta có:

\(x+y+\dfrac{1}{x}+\dfrac{1}{y}\le x+y+\dfrac{\left(1+1\right)^2}{x+y}=x+y+\dfrac{4}{x+y}\le1+\dfrac{4}{1}=5\)

-Dấu bằng xảy ra \(\Leftrightarrow x=y=\dfrac{1}{2}\)

NV
11 tháng 8 2021

ĐKXĐ: \(x\ge0;x\ne4\)

\(A=\dfrac{x}{\left(\sqrt{x}-2\right)\left(\sqrt{x}+2\right)}+\dfrac{\sqrt{x}+2}{\left(\sqrt{x}+2\right)\left(\sqrt{x}-2\right)}+\dfrac{\sqrt{x}-2}{\left(\sqrt{x}-2\right)\left(\sqrt{x}+2\right)}\)

\(=\dfrac{x+2\sqrt{x}}{\left(\sqrt{x}-2\right)\left(\sqrt{x}+2\right)}=\dfrac{\sqrt{x}\left(\sqrt{x}+2\right)}{\left(\sqrt{x}-2\right)\left(\sqrt{x}+2\right)}=\dfrac{\sqrt{x}}{\sqrt{x}-2}\)

b. \(x=36\Rightarrow A=\dfrac{\sqrt{36}}{\sqrt{36}-2}=\dfrac{6}{6-2}=\dfrac{3}{2}\)

c. \(A=-\dfrac{1}{3}\Rightarrow\dfrac{\sqrt{x}}{\sqrt{x}-2}=-\dfrac{1}{3}\Rightarrow3\sqrt{x}=2-\sqrt{x}\)

\(\Rightarrow4\sqrt{x}=2\Rightarrow\sqrt{x}=\dfrac{1}{2}\Rightarrow x=\dfrac{1}{4}\)

d. \(A>0\Rightarrow\dfrac{\sqrt{x}}{\sqrt{x}-2}>0\Rightarrow\sqrt{x}-2>0\Rightarrow x>4\)

e. \(A=\dfrac{\sqrt{x}-2+2}{\sqrt{x}-2}=1+\dfrac{2}{\sqrt{x}-2}\in Z\Rightarrow\sqrt{x}-2=Ư\left(2\right)\)

\(\Rightarrow\sqrt{x}-2=\left\{-2;-1;1;2\right\}\)

\(\Rightarrow\sqrt{x}=\left\{0;1;3;4\right\}\Rightarrow x=\left\{0;1;9;16\right\}\)

a: Ta có: \(A=\dfrac{x}{x-4}+\dfrac{1}{\sqrt{x}-2}+\dfrac{1}{\sqrt{x}+2}\)

\(=\dfrac{x+\sqrt{x}+2+\sqrt{x}-2}{\left(\sqrt{x}-2\right)\left(\sqrt{x}+2\right)}\)

\(=\dfrac{\sqrt{x}}{\sqrt{x}-2}\)

b: Thay x=36 vào A, ta được:

\(A=\dfrac{6}{6-2}=\dfrac{6}{4}=\dfrac{3}{2}\)

c: Để \(A=-\dfrac{1}{3}\) thì \(3\sqrt{x}=-\sqrt{x}+2\)

\(\Leftrightarrow4\sqrt{x}=2\)

hay \(x=\dfrac{1}{4}\)

1: Để A>0 thì x-1<0

hay x<1

Kết hợp ĐKXĐ, ta được: \(0\le x< 1\)

 

29 tháng 8 2021

1) Để A > 0 thì:

\(x-1< 0\Leftrightarrow x< 1\)

\(\Rightarrow0\le x< 1\) và \(x\ne1\)

2) \(A=\dfrac{\sqrt{x}+1}{\sqrt{x}-1}=1+\dfrac{2}{\sqrt{x}-1}\)

Để A<1 thì \(\dfrac{2}{\sqrt{x}-1}< 0\)

\(\Rightarrow\sqrt{x}-1< 0\Leftrightarrow\sqrt{x}< 1\)

Mà x\(\ge0,x\ne1\)

\(\Rightarrow0\le x< 1\)

a Khi m=1 thì (1) sẽ là x^2+1=0

=>x thuộc rỗng

b: Thay x=1 vào (1),ta được:

1^2-2(m-1)+m^2=0

=>m^2+1-2m+2=0

=>m^2-2m+3=0

=>PTVN

c: Thay x=-3 vào pt, ta được:

(-3)^2-2*(m-1)*(-3)+m^2=0

=>m^2+9+6(m-1)=0

=>m^2+6m+3=0

=>\(m=-3\pm\sqrt{6}\)

a: ĐKXĐ: x<>1

Sửa đề: \(C=\dfrac{5x+1}{x^3-1}+\dfrac{2x-1}{x^2+x+1}+\dfrac{2}{x-1}\)

\(=\dfrac{5x+1+\left(2x-1\right)\left(x-1\right)+2x^2+2x+2}{\left(x-1\right)\left(x^2+x+1\right)}\)

\(=\dfrac{2x^2+7x+3+2x^2-2x-x+1}{\left(x-1\right)\left(x^2+x+1\right)}\)

\(=\dfrac{4x^2+4x+4}{\left(x-1\right)\left(x^2+x+1\right)}=\dfrac{4}{x-1}\)

b: |x|=4

=>x=4 hoặc x=-4

Khi x=4 thì \(C=\dfrac{4}{4-1}=\dfrac{4}{3}\)

Khi x=-4 thì \(C=\dfrac{4}{-4-1}=\dfrac{4}{-5}=\dfrac{-4}{5}\)

c: C>0

=>4/x-1>0

=>x-1>0

=>x>1

d: C nguyên

=>x-1 thuộc {1;-1;2;-2;4;-4}

=>x thuộc {2;0;3;-1;5;-3}

2 tháng 11 2023

Trong xu thế hội nhập hiện nay, hợp tác quốc tế là vấn đề quan trọng và tất yếu của mỗi quốc gia, dân tộc trên thế giới. Trong những năm gần đây, Việt Nam đã và đang trở thành một trong những điển hình về hợp tác quốc tế

a, từ nhận định trên em hãy cho biết hợp tác là gì? cơ sở và nguyên tắc của đang và nhà nước ta?

b, nêu 1 số thành quả hợp tác giữa các nước ta và các nước trên thế giới? từ đó em hãy cho biết hộc sinh hiên nay cần phải làm gì để rèn luyện tinh thần hợp tác

6 tháng 5 2020

235m2:100 nhân 24 = 56,4

350:100 nhân 0,8 = 2,8

9 tháng 11 2021

\(a,76=2^2\cdot19\\ 1995=3\cdot5\cdot7\cdot19\\ \RightarrowƯCLN\left(76,1995\right)=19\)

\(b,\) Gọi \(d=ƯCLN\left(2n+1,3n+1\right)\)

\(\Rightarrow2n+1⋮d;3n+1⋮d\\ \Rightarrow3\left(2n+1\right)-2\left(3n+1\right)⋮d\\ \Rightarrow1⋮d\\ \Rightarrow d=1\)

Vậy \(ƯCLN\left(2n+1,3n+1\right)=1\)

a: UCLN(76;1995)=19

4 tháng 5 2016

a)1/2 của 60 là 30

1/3 của 60 là 20

1/5 của 60 là 12

1/6 của 60 là 10

1/10 của 60 là 6

1/12 của 60 là 5

b) 15% của 60 là 9

20% của 60 là12

50% của 60 là 30

75% của 60 là 45

c) 60 chia hết cho 60; 30; 20; 15; 12; 5; 4; 3; 2; 1.

6 tháng 5 2018

a ) 1/2 của 60 là : 60 * 1/2 = 30

     1/3 của 60 là : 60 * 1/3 = 20

      1/5 của 60 là : 60 * 1/5 = 12

      1/6 của 60 là : 60 * 1/6 =10 

       1/10 của 60 là : 60 * 1/10 = 6

        1/12 của 60 là : 60 * 1/12 = 5

b ) 15% của 60 là : 60 * 15% = 9

      20 % của 60 là : 60 * 20% = 12

       50% của 60 là : 60* 50% = 30 

        75% của 60 là : 60 * 75/100 = 45

c ) Các số mà 60 chia hết ch nó là : { 1 , 2 , 3 , 5 , 6 , 10 , 12 , 15 , 20 , 30 , 60 }