Bài 6: Chứng minh rằng:
a) x2 – x + 1 > 0 với mọi số thực x
b) -x2+2x -4 < 0 với mọi số thực x
Bài 7: Tính nhanh giá trị biểu thức:
tại x = 18; y = 4
b) (2x + 1)2 + (2x - 1)2 - 2(1 + 2x)(1 - 2x) tại x = 100
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II. Choose the best answer.
1. My dad doesn’t mind…………… my mom from work every day.
A. pick up B. picked up C. picking up D. picks up
2. Using computers too much may have harmful effects …….. . your minds and bodies.
A. on B. to C. with D. onto
3. I love the people in my village. They are so………………… and hospitable.
A. friendly B. vast C. slow D. convenient
4. Among the ………………, the Tay people have the largest population.
A. groups B. cultures C. ethnic minorities D. ethnic
5. People in the countryside live ……………… than those in the city.
A. happy B. more happily C. happily D. less happy
6. Viet Nam is …………. multicultural country with 54 ethnic groups.
A. a B. an C. the D. A and C
7. The farmer rides the buffalo - ……………… carts loaded full of rice home. | ||||
A. draw | B. drawing | C. drew | D. drawn | |
8. Does she fancy …………… a book to the younger children?
A. reads B. reading C. to read D. read
9.The US is a…………..…..country with over 80 ethnic groups.
A. multi-cultural B. bi-lingual C. rich D. ethnic
10. So many people nowadays are……computers and mobile phones. They use them a lot.
A. addicted B. bored C. worried about D. afraid of
11.Life in a small town is ………………………………… than that in a big city.
A. peaceful B. much peaceful C. less peaceful D. much more peaceful
12.The boys often help their parents to …………………………water from the village well.
A. gather B. collect C. give D. find
13.The Viet people have many _______ customs and crafts.
A. tradition B. traditional C. culture D. customary
14.Nam enjoys ________ so early in the morning.
A. getting up B. get up C. to get up D. gets up
15.Mary is ________responsible as Peter.
A. more B. the most C. much D. as
16.It is ________ in the city than it is in the country. noisier
A. noisily B. more noisier C. D. noisy
17._________ month is the Hoa Ban festival of the Thai people held in?
A. When B. Which C. How many D. How often
18.It is typical of the cultural life of _______ Thai people.
A. some B. a C. the D. an
19.During the festival, they fly many __________ kites in different shapes and sizes.
A. colour B. colourless C. colourful D. colouring