Ta có :

x² + x - p = 0

=> x.(x + 1) = p

x và x + 1 là 2 số nguyên liên tiếp nên x chẵn hoặc x + 1 chẵn

Do đó x.(x + 1) = p chẵn

Mà số nguyên tố chẵn duy nhất là 2 nên p = 2

Khi đó ta có x.(x + 1) = 2 = 1 . 2 = 1 . (1 + 1)

Vậy x = 1

Hai số đó cách nhau là:

(36.2)+2=76 đơn vị

=> Hiệu 2 số là 76 

Số bé là:

(474-76):2=199

Số lớn là:

474-199=275

Đáp số: số bé:199; số lớn 275

A.grocery B.money C.month D.mother

Every day, I always take care of my teeth. I brush my teeth three times a day. I usually eat calcium-containing foods so that my teeth are firm and full. Flour helps keep the teeth from worms. That's how I get a healthy teeth.

1/ In electronics they learn to repair __household____ appliances. (HOUSE)

2/ I'd like a nice __juicy___ orange. (JUICE)

3/ I have __less____ time to play than my friends. (LITTLE)

PASSAGE

James has two jobs. (1) __On____ Monday, Tuesday and Wednesday he works in a (2) _Hospital_____ where helps to look after children who (3) _are_____ ill. He goes to the hospital (4) _by_____ bus. He starts (5) _work_____ at ten o'clock and works until quarter (6) _to____ five. He (7) __stays____ at home on Thursday and Friday, he writes stories. In (8) __the_____ evening, one of his roommates cooks the meal. After dinner, they (9) __look___ at the newspaper to see what's on TV or they (10) __talk_____ about the day.

The condition of your heart is directly related to the amount of stress you regularly experience. Be aware of stress in your life and train yourself to counteract its disastrous effects. These are some of the deliberate steps you may take to reduce stress:

1. Enjoy a lengthy vacation yearly. Don’t take your work with you; forget all about the office.

2. Be certain that what you are doing is what you really want to do.

3. Face each challenge realistically. Don’t attempt to do more each day than you possibly can do well. You need to fell satisfied with your accomplishments daily.

4. Relax every evening and do the things you enjoy whether this means strenuous exercise like tennis or curling up in a comfortable chair and reading a mystery.

1. The purpose of this passage is to ...........................................................

A. show the effects os stress upon the heart

B. describe symptoms os stress

C. help you reduce stress

D. encourage you to reduce stress

2. One of the causes of stress is .......................................

A. loving your work B. playing tennis too strenuously

C. attempting to do more than possiable D. a heart condition

3. The passage says that .........................................

A. strenuous exercise can damage your heart

B. your heart can create stress

C. reading a mystery can create stress

D. no matter what you do, you will regularly encourage stress

4. The passage says that the first thing to do about stress is ....................................

A. ignore it because it can be alleviated

B. talk to your boss about a vacation

C. do things you like to do

D. be aware of its existence in your life

5. To '' reduce'' means .....................................................

A. to increase B.to rain C. to diminish D. to obtain

Mắt của một người có điểm cực viễn Cv cách mắt 50cm. Muốn nhìn thấy vật ở vô cực không điều tiết người đó phải đeo kính có độ tụ bằng bao nhiêu? ( kinh đeo sát mắt).

1.A

2.C

3.A

4.D

5.B

Every body knows the symptoms but no one knows a cure.( Tại thầy mik bảo thế :3 )