3x = 2y =5z và x-y+z=55

DDDFdssadasdsa

Cho tam giác ABC vuông tại A. CM:

tan $\frac{ABC}{2}=\frac{AC}{AB+BC}$

Cô Hoàng Thị Hiên giúp em với ạ. Em cảm ơn

Cho tam giác ABC vuông tại A. CM:

tan $\frac{ABC}{2}=\frac{AC}{AB+BC}$

Hiện nay , mẹ hơn con 24 tuổi . Cách đây 3 năm , tuổi con bằng 1/4 tuổi mẹ . Tính tuổi của mẹ và con hiện nay

Câu 27. Cấu hình electron của ion nào dưới đây giống cấu hình e của khí hiếm?

A. Fe2+   

B. Cr3+

C. Cu+

D. K+

11. Phát biểu nào sau đây không đúng với gió mùa?

A. Mùa đông thổi từ lục địa ra đại dương.

B. Mùa hạ thổi từ đại dương vào đất liền.

C. Do chênh lệch áp giữa các đới gây ra.

D. Thường xảy ra ở phía đông đới nóng.

So sánh A = (10+1)(10^2 +1)(10^4+1)(10^8+1)(10^16 +1) và B = 10^32 – 1

The Imperial Hotel was built in 2005.

II. Rewrite these sentences in such a way that the sentences you write remain unchanged from the

original ones. 

1. We were so interested in the comedy that we laughed from the beginning to the end.

The comedy ……………………………………………………….……………..

2. The film didn’t receive good investment but it was a great success.

Despite ………………………………………………………………………….

3. With luck, she will win the cookery competition.

If she …………………………………………………………………………….

4. That is not her invention.

That invention ……………………………………………………………………

5. I think John acted better than Mary in that play.

I think Mary didn’t …………………………………. ………………………….

Exercise 3: Choose the best answer.

1.    Examinations make me __  . I always get __( angry/ being nervous,  anger/ nervous,  angrily/ nervous,  angry/ nervous)

2.    Goodyear worked _____ for the benefit of mankind. ( devote,  devoted,  devotedly,  more devotedly)

3.    Mike was not feeling very well so we gave him __to do than you. ( fewer works,  less work, little works,  least work)

4.    Everyone looks much ____today than he did yesterday. ( happy,  happily,  more happily ,  happier)

5.    I found it very _____ to read the book. ( amusing,  amused,  amuse,  amusingly)

6.    A man whom people can not trust will have ____ friends. ( little,  few,  a few,  a lot)

7.    My younger brother grew very quickly and he was ____ his mother. (more big that, so big than, as big as, too big than)

8.    The mother looked _____ at her naughty child. ( anger,  angry,  angrily,  angered)

9.    It was _____ that we decided to buy it. ( a such beautiful house,  such a beautiful house,  so beautiful house,  so a beautiful house)

10.  ____ these mangoes taste____? ( Do/ sweetly,  Do/ sweet,  Have/ sweetly,  Are/ sweet)

11.  Your plan sounds ____ to me, ( perfect, perfected,  perfectly,  perfection)

12.  This room is _____ small for six of us to live in.( as,  much,  too,  as much)

13.  The younger you are , ___you learn. ( the quicker,  the quicklier,  the more quickly,  the less quickly.

14.  Yesterday was _____ day of the year. ( the cold,  the coldest,  the colder,  coldest)

15.  Do it as _____ as you can. ( good,  well,  better,  very good)

16.  The smaller the room, _____ furniture it needs. ( the fewer,  the more, the smaller,  the less)

17.  Our English lessons are becoming _____ ( more and more difficult,  more difficult and more difficult,  more difficult and difficult,  most difficult)

18.  Her house is twice _____ mine. ( as big as, bigger than,  the biggest,  big)

19.  Is this ______ pen you’ve got? ( the cheap, the cheapest,  cheapest,  cheaper)

20.  My job is boring. I’d like to do something __( interesting,  most interesting,  more interesting,  interestingly)

21.  Tom is the ______ of the 2 brothers . ( older,  oldest,  old,  elder)

22.  You are driving too fast . Can you drive__? ( a bit slowly,   a bit more slowly,  slowly a bit,  slowlier)

23.  He is _____ than I first thought. ( little stupid,  few stupid,  less stupid,  the least stupid)

24.  She is a _____ and______ driver than her brother. ( slower/ more careful,  more slowly/ more carefully,  slower/ careful,  more slower/ more careful

25.  Mercedes is the __ car of all. (the most expensive, the more expensive, expensive, the expensivest)

26.  It’s _____ to learn a foreign language in a country where it is spoken. ( a lot easier,  easier a lot,  a lot easy,  a lot more easy)

27.  Of all the girls she sang _____. (better, good, the best, very well)

28.  Rose is a _____ working student ; she ____ waste a minutes of her time. ( hardly/ hard,  hard/ hard,  hardly/ hardly,  hard/ hardly)

29.  I drive much_____ than I did 2 years ago. ( careful,  carefully, more careful,  more carefully)

30.  He got up _____ miss the first bus. (so earlier as to, so early to, so early as not to, too early to)

Exercise 2: Rewrite each sentence, beginning as shown, so that the meaning stay the same.

1.    He works hard. We work hard, too.  

We..........................................................................................................................................................

2.    I can't cook as well as my mother. 

 My mother..............................................................................................................................................

3.    Sang is better at English than Mai is

  Mai isn't.................................................................................................................................................

4.    No one in this club plays tennis as well as Janet  

 Janet plays..............................................................................................................................................

5.    He run fast, I can run faster

 I can........................................................................................................................................................

6.    This is the pumpiest road I've ever driven along.

 I've never................................................................................................................................................

7.    She didn't draw as beautifully as Tim.

Tim.........................................................................................................................................................

8.    Barbara can skate just as well as John can.

 John can't skate......................................................................................................................................

Cho 0,8 hỗn hợp Fe và Mg tác dụng hoàn toàn với dung dịch HCl dư sinh ra 4,48l khí H2(đktc). Thành phần phần trăm về khối lượng của Fe và Mg là:

A. 70% và 30%

B. 60% và 40%

C. 50% và 50%

D. 80% và 20%

Tóm tắt và có lời giải giùm mình với. Mình cảm ơn:((

Exercise 1: Completes the following sentences with  comparatives or superlatives. Use the words in brackets and add any other necessary words.

1.    Sometimes I feel all of my friends are (intelligent)……………….. I am, and yet, sometimes they tell me that they think I am (smart)……………..person …..............the class.

2.    Mercury is (close)…………..planet to the sun. It moves around the sun (fast)……………any other planet in the solar system.

3.    One of (popular) ………….holidays……………Vietnam is New year’s.

4.    In terms of area, (large) ……..state………..United states is Alaska, but it has one of (small) …………..populations………….all the states.

5.    Nothing is (important)……….good health. Certainly, gaining health is much (important)…………enjoying good health.

6.    You can trust her. You will never meet a (honest)………….person…………she is.

7.    Both Bangkok and Venice are famous for their waterways, but Bangkok has (extensive) …….canals…………….Venice has.

8.    I feel (safe)………in a plane …………I do in a car.

9.    My friend has studied many languages. He thinks Japanese is (difficult)…………all the languages he has studied.

10.  One of (bad)………..nuclear accidents…………..the world occurred at Chernobyl in 1986.

11.  Jakarta is (large)…….city in Indonesia.

12.  Mountain climbing takes (strength)……………….walking on a level path.

13.  The (short)………….distance between two points is straight line.

14.  Cheese usually tastes (good)……………..at room temperature than it does just after you take it out of the refrigerator.

15.  I think learning a second language is (hard)…………learning chemistry or mathematics.