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Từ 4 chữ số 0,1,2,3 Ta có các cách chọn như sau

Hàng nghìn    3 cách[vì số 0 ko thể được chọn làm chữ số hàng nghìn]

Hàng trăm     4 cách

Hàng chục     4 cách

Hàng đơn vị   4 cách

Từ các cách chọn trên,ta có :3 x 4 x 4 x 4 = 192

Vậy có 192 số có 4 chữ số được lập từ các chữ số 0,1,2,3.

Cho ba điểm D, E, F không thẳng hàng.

Vẽ đường thẳng a cắt đoạn thẳng DE, EF nhưng không đi qua D, E, F.

Đoạn thẳng DF có cắt đường thẳng a không?

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 30 to 34.

Body language is a vital form of communication. In fact, it is believed that the various forms of body language contribute about 70 percent to our comprehension. It is important to note, however, that body language varies in different cultures. Take for example, eye movement. In the USA a child is expected to look directly at a parent or teacher who is scolding him/her. In other cultures the opposite is true. Looking directly at a teacher or parent in such a situation is considered a sign of disrespect.

Another form of body language that is used differently, depending on the culture, is distance. In North America people don't generally stand as close to each other as in South America. Two North Americans who don't know each other well will keep a distance of four feet between them, whereas South Americans in the same situation will stand two to three feet apart. North Americans will stand closer than two feet apart only if they are having a confidential conversation or if there is intimacy between them.

Gestures are often used to communicate. We point a finger, raise an eyebrow, wave an arm – or move any other part of the body – to show what we want to say. However, this does not mean that people all over the world use the same gestures to express the same meanings. Very often we find that the same gestures can communicate different meanings, depending on the country. An example of a gesture that could be misinterpreted is sticking out the tongue. In many cultures it is a sign of making a mistake, but in some

places it communicates ridicule.

The dangers of misunderstanding one another are great. Obviously, it is not enough to learn the language of another culture. You must also learn its non-verbal signals if you want to communicate successfully.

The word "intimacy" in paragraph 2 is closest in meaning to ______.

A. enjoyment

B. closeness

C. strength

D. agreement

Hãy lập các số tự nhiên có ba chữ số khác nhau và chia hết cho 3 từ các chữ số: 0; 1; 2; 3

222*222/222= 222