1. Cho tam giác ABC , M là trung điểm AB , N thuộc cạnh AC sao cho NC=2NA , K là trung điểm MN
a) chứng minh vecto KA=1/4AB+1/6AC
b) gọi D là trung điểm BC chứng minh vecto KD=1/4AB+1/3AC
2. Cho tam giác ABC trung tuyến AM , I là trung điểm AM , K là điểm trên cạnh AC sao cho AK=1/3AC
a) phân tích vecto BI , BK theo vecto a=vecto BA vecto b= vecto BC
b) chứng minh B,I,K thẳng hàng
1. They refuse ________ the donation from the government.
A. receiving B. to receive C. receive
2. The Bakers hire a young man __________ on their farm during the harvest.
A. work B. to work C. working
3. I heard someone ________ outside when I was watching TV.
A. to fall B. fall C. fell
4. The boy was able ________ the piano when he was small.
A. play B. playing C. to play
5. He advises Julia ________ to the dentist.
A. to go B. go C. going
6. He does not seem ________ passion for this job.
A. have B. having C. to have
7. Would you like ________ with music?
A. dance B. to dance C. dancing
8. Sam wanted me ________ there early in the morning.
A. come B. coming C. to come
9. Have you ever expected _______ an astronaut?
A. to become B. become
1) xác định số hạt mỗi loại loại trong nguyên tử X
a) nguyên rử nguyên tố X có tổng số hạt cơ bản là 40 biết số khối Y nhỏ hơn 28
b) ---------------------------------------------------------------- 34--------------------------------- 24
2) nguyên tử X có tổng số hạt p,n,e là 28 hạt xác định tên X ?
The family in Britain is changing. The once typical British family headed by two parents has undergone substantial changes during the twentieth century. In particular there has been a rise in the number of single-person households, which increased from 18 to 29 per cent of all households between 1971 and 2002. By the year 2020, it is estimated that there will be more single people than married people. Fifty years ago this would have been socially unacceptable in Britain.
In the past, people got married and stayed married. Divorce was very difficult, expensive and took a long time. Today, people's views on marriage are changing. Many couples, mostly in their twenties or thirties, live together (cohabit) without getting married. Only about 60% of these couples will eventually get married.
In the past, people married before they had children, but now about 40% of children in Britain are born to unmarried (cohabiting) parents. In 2000, around a quarter of unmarried people between the ages of 16 and 59 were cohabiting in Great Britain. Cohabiting couples are also starting families without first being married. Before 1960 this was very unusual, but in 2001 around 23 per cent of births in the UK were to cohabiting couples.
People are generally getting married at a later age now and many women do not want to have children immediately. They prefer to concentrate on their jobs and put off having a baby until late thirties.
The number of single-parent families is increasing. This is mainly due to more marriages ending in divorce, but some women are also choosing to have children as lone parents without being married.
1: which of the following could be the best title forr the passage ?
A. changing vuales and norms of the british family
B. changes inn marriage among british young generations
C. changing insights into and ideas of the british family
D. changes in viewpoints and lifestyles of british couples
2: the word WHICH in the passage refers to ....
A. the family in britain
B. substantial changes
C. typical british family
D. single-parent household
3: which of the following is NOT true according to the passage
A. in the past british people had to pay a lot if they wanted to get divorced
B. half of the children in britain now are born to unmarried couples
C. women in britain now do not want to have children right after marriage
D. there are more and more single - parent families in britain these days