1. Cho ABCD là hình thoi. Gọi M, N, P, Q theo thứ tự là trung điểm của AB, BC, CD, AD. CMR: MNPQ là hình chữ nhật.

2. Cho ABCD là hình chữ nhật. Gọi M, N, P, Q lần lượt là trung điểm của AB, BC CD, AD. CMR: MNPQ là hình thoi.

GIÚP MÌNH VỚI MAI PHẢI NẠP BÀI RỒI!

1.Nobody saw her book at the party.
=> She ......................................................
2.He started learning Chinese last year.
=> He has..................................................
3.Thousands of people have been made _______ by the flood. ( HOME)

I. Choose the best answer.
1. That child ........ to go at ance.
A. will B. had better C. has D. have
2. The front yard is ...... to ply soccer in.
A. small too B. so small c. too small D. very small
3. My brother feels ............. again after hs operation.
A. strongly B. stength C. strong D. enough strong
4. This form must have the ...... of the writer.
A. to sign B. signature C. signing D. sign
5. Jane and Jack stood in front of the mirror and looked at............
A. herself B. him self C. theirselves D. themselves
6. The show last night was so ........ that we saw it through.
A. fascinating B. fascinated C. boring D. excited
II. Rewrite these following sentences keep meaning as the root one.
1. The robbers made the bank manager hand over the money.
=> The bank manager .....................................................................................
2. They first printed "The Time" two hundred years ago.
=> "The Time" .................................................................................................
3. Somebody repaired her car yesterday.
=> She .......................................................................................................
4. I've never met a more intelligent man than him.
=> He is ......................................................................................
5. Everyday I spend two hours learning english.
=> Everyday It takes ........................................................................
III. Give the correct form of the words in the brackets.
1. We have two postal ............................................... a day. (DELIVER)
2. He left the room without ............................................... . (EXPLAIN)
3. Playing tennis is one of his favorite ................................. . (ACT)
4. We started our trip on a beautoful ................................................. morning. (SUN)
5. They left the house in a ............................................ mess. (FRIGHT)

I. Rewrite
1. Can you use this computer?
=> You can ___________________________________.
2. Nga spend 4 hours a day practicing English with her friends.
=> It takes ________________________________________.
3. I couldn't sleep. I was tỉed.
=> Although _______________________________________.
4. Keeping the enviroment clean is very importain.
=> It's ___________________________________________.
II. Choose the best answer to complete the sentences by circling A, B, C or D.
1. My school will ______ the school festival next week.
A. organize B. take C. rehearse D. play
2. __________ silly mistake!
A. What B. What a C. How D. How a
3. This food taste _______.
A. careful B. carefully C. delicious D. deliciously
4. The _________ is taking Mary's temperature now.
A. nurse B. worker C. player D. scientist
5. Would you like some corn? - _____________
A. No, thanks. I'm full B. Ok. I don't like corn
C. All right D. Yes, I would
6. Why ______________?
A. those men are laughing B. are laughing those men
C. are those men laughing D. are those laughing men
7. ______________? - That good idea.
A. Do you like playing sports B. Can you buy me some apples
C. Why don't we go out for dinner D. May I borrow your pen
8. I am not sure where she is. She _______ be in her office.
A. must B. may C. can D. should
9. ______ do you pay a visit to your uncle? - Every other week.
A. Why B. When C. How often D. How long
10. Mai : I don't like travelling a lot. Lan: _____________
A. So do I B. I don't, too C. Either don't I D. Neither do I
III. Fill in each numbered space with ONE appropriate word.
Ho Chi Minh was born in 1890 in Nghe An ......(1)........, in the village of Kim Lien. When he ......(2)....... 21 years old, he ....(3)..... Viet Nam and travelled to Africa, England and America. After this, he worked in a hotel in London in the early 1900s then moved to Paris in 1917. He ....(4)..... six years in Paris, one ....(5)........in Moscow and then moved to Guangzhou. he founed ......6)...... Indochinese Communist Party when he lived in Guangzhou. ....(7)..... the 1930s ho Chi Minh continuted to travel and after his return to Viet Nam he formed the Viet Minh in 1941. Fours years .....(8)...., he came ....(9).... of the democratic Republic of Viet Nam after viet Nam declared its independence. Ho Chi Minh died in Ha Noi in 1969, but he will always be ....(10).... by the Vietnamese people.
IV. Fill in each blank with a suitable preposition.
1. Gangman style, by a 23-year-old south Korean Singer, psy, first appeared_______ YouTube in July.
2. I bought some souvenirs ____ my friends when I was in Nha Trang.
3. Fiona is getting better and better ________ writing compositions.
4. Our country is rich _______ oil ang rubber.
5. The school cafeteria only opens ______ lunchtime.
6. My mother is very keen _________ growing roses.
7. The science books are ________ the rack ________ the corner of the room.
8.I am 13 years old now. I prefer to talk ________ people _______ my age.

Chosse the best answer to complete the sentences by circling A, B, C or D.
1. His house looks very large and beautiful. It is __________ house.
A. a seven-room B. a seven-rooms C. seven room D. seven rooms
2. If you get up early, you ________ late.
A. weren't B. wouldn't be C. aren't D. won't be
3. When he lived in the city, he ___________ to the theater twice a week.
A. uses to go B. has gone C. used to go D. was going
4. Nobody went to the party, __________?
A. does he B. do they C. didn't they D. did they
5. If we ________ enough time, we'll study this exercise more carefully.
A. will have B. have C. had D. would have
6. Honda motorbikes _______ in Viet Nam.
A. produce B. will produce C. are produced D. would be produced
7. We have learnt English _________ 2001.
A. for B. since C. in D.during
8. Your sister works in a foreign company, __________ she?
A. isn't B. didn't C. wasn't D. doesn't
9. _________ Friday morning, there is a meeting between 11a.m and 1p.m.
A. In B. For C. On D. At
10. Don't forget to buy me a dictionary, _________ ?
A. do you B. will you C. shall you D. don't you

Bài này là của sinh học lớp 8 mà

bạn ơi x5 đó là x mũ 5 không vậy bạn

Bài 1. A= 3x^2y-5x^2y
= 3.(-2)^2.0,5-5.(-2)^2.0,5
= -4
Bài 2. a) A= 3xy^2+8xy+1
b)A= 3.(-1/2).1^2+8.(-1/2).1+1
=-9/2