giai phuong trinh
x⁴ - 5x² - 2x + 3 = 0

Bai 1 ; Giai phuong trinh
(x³ - x²) - 4x² + 8x - 4 = 0

1. Read the following passage and choose the item (a, b, c, or d) that best answers each of thequestions about it.

Is computer shopping the way of the future? About 37% of American households now have personal computers. Andshopping by computer (or “shopping on-line) is interesting to more people every day. Already, shoppers I can usetheir computers to order many different products, such as computer products, flowers, food, T-shirts, and posters. Andnew online shopping services appear every day. Soon people may be able to shop for anything, anytime, anywhere in the world.

1. What is the passage written about?

A. Computer shopping B. Personal computer

C. The future in America D.Shopping

2. Whatdoes the word "their" in line 4 refer to?

A. people B. shoppers C. households D. personal computers

3. Shoppers can buy _____ by computer.

A. many different products B. anything

C. food D. A&C

4. What does the word "appear" in the sentence “new online shopping services appear every day" mean?

A. become available for the first time B. be bought

C. be sold D. arrive somewhere

4. Which of the following is not true?

A. About 63% of American households don't have personal computers now.

B. Now many people find it interesting to shop by computer

C. "Shopping by computer" is also called as "shopping on-line".

D. Nowadays, it is certain that people can buy anything, anytime, anywhere by computer.

WORD FORM & VERB TENSES OF UNIT 7-8 (ENGLISH 8TH)
II. VERB TENSES :
1.A koala (spend) __________________ about 18-20 hours sleeping in tree forks.
2.It’s only my first week in Wales, and I (see) ___________________ so many interesting things already.
3.The number of kiwis in this area (decrease) ___________________ quickly.
4.The Aborigines (live) ________________ in Australia for more than 40,000 years.
5.Most European citizens (not have) _________________ to apply for a visa to visit Canada.
6.At the moment, thousands of people (gather) _________________ in Trafalgar Square, London.
7.The kangaroo (become) __________________ a symbol of Australia since 1773.
8The bald eagle, an American symbol, (not live) ____________________ in any other places besides North America.
9.I think Mr. Viet (not be) ___________________ to Northern Ireland yet.
10.The Taylors (not stay) _____________________ in New York now. They moved to San Francisco last month.
11.Canada (be) __________________ made up of 10 provinces and 3 territories.
12.Australia (have) ____________________ a wide range of different landscapes.
13.Annually, the National Eisteddfod festival of Wales (take) ____________________ place at the start of August.
14.The statue of Liberty (welcome) ___________________ over 12 million immigrants entering the USA through New York Harbor since 1900.
15.Each of the 50 states (adopt) ___________________ an official state flower so far.
16.Since 1965, the maple tree with the leaves (become) __________________ the most well-known Canadian symbol.
17.At present, the National Cherry Blossom Festival (occur) _________________ in Washington, D.C.
18.Maori (be) ___________________ recognized as an official language of New Zealand since the Maori language Act of 1978.
19.In Canada, New Year’s Day ____________________ a long tradition of celebration. (have)
20.First names ___________________ used more frequently in Australia than in other countries. (be)
21.Recently, many places in New Zealand ___________________ called with two names. (be)
22.Maoria people __________________ the hongi- touching noses – to greet people they ________________ safe and familiar with. (use – feel)
23.Since its beginning more than a century ago, the slouch hat _________________ one of the most distinctive items of Australian clothing. (become)
24.For over 130 years, Akubra hats ____________________ its legendary stories in Australia. (make)
25.Ireland ___________________ the Eurovision Song contest seven times .(win)
26. In Canada you should maintain eye contact while you________hands.(shake)

Ex 4: Word form
4._________elements have been found in both ground and underground water sources . (pollute)
5. Fish and many other animals are killed by_________in their habitats . (pollute)
6. Astronomers are concerned about light pollution because thay have______in viewing activities in the sky and outer space. ( difficult)
7. _____habitats have been destroyed in recent years . (nature)
8. A number of cleaning products contain _______chemical. (harm)
9. Water samples collected at these villages were seriously_______with bacteria. ( contaminate)
10.People believe that the_______water has brought cancer to the local resident . (pollute)
11. Light pollution makes us _________to see the stars in the sky.(able)
12. Noise is considered as__________pollution.(environment)
13. The_______of lake, rivers, oceans or underwater causes water pollution .( cotaminate)
14. The street dosen't look_____because it has a lot of rubbish .(attract)
15. Are all types of pollution_____to the health of human and animals. (harm)
16.The_____are concerned about the oil spills in the East Sea. (environment)
17. Dumping _____ waste into the lakes and rives has caused serious water pollution. ( industry)
18. Many people in this area have cholera because they drink_____water.(treat)
19. Examples of primary _______are exhaust fumes from cars, soot from smoke. (pollute)
20. If we use water____, more people will have fresh water.(care)
21. The polluted water resuilts in the_______of many aquaticanimals and plants. (die)
22. Both French and English are ______languages in Canada. ( office)
23. NSW is the ______of New South Wales , the most populous state in Australia. (abbreviate)
24. Do you know that the telephone , the televison , and penicillin are Scottish____? (invent)

bai 1: worl form:

1. The soil becoms________because of the use of so many pesticides and fertilizers. (contaminate)
2. ___________waste spills can contaminate groundwater. (industry)
3. In many developing cointries, water pollution is usually a leading cause of __________ . (die)

Bai 1:
a) giai phuong tirnh:
\(\dfrac{2x-1}{x-1}+\dfrac{x}{x^2-3x+2}=\dfrac{6x-2}{x-2}\)

b) Tim GTNN cua A:
\(\sqrt{x^{2^{ }}-x+1\dfrac{1}{4}}-2016\)

Bai 1: Cho tam giac ABC nhon, duong cao BD, CE
a) CMR: tam giac ABD dong dang voi tam giac ACE
b) CMR: goc BED + goc BCD = 180 do
c) Cho goc BAC = 60 do; dien tich tam giac AED = 90 do . Tinh tam giac ABC