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Bài 1: Trong mặt phẳng Oxy, hãy viết phương trình tổng quát của: a) Ox b) Oy Bài 2: Cho đường thẳng ( Δ ) có phương trình 2x+3y-7=0 và điểm M(-1;5). Viết phương trình tổng quát của đường thẳng ( d) trong mỗi trường hợp sau : a) (d) đi qua M và song song với (Δ) b) (d) đi qua M và vuông góc với (Δ)
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VI. Read the passage and then answer the questions. In the world today there are 5,000 to 6,000 living languages, of which English is the most widely used. As a mother tongue, it ranks second only to Chinese, which is little used outside China. English is the most international of languages. It is used as the language of aviation, international sport and pop music. Sixty percent of the world’s radio stations broadcast in English, and more than half of the world’s scientific papers are printed in English. It is true that a great number of people are involved in the use of English. To people in Africa, Asia, and South America, English is an important foreign language to master. In most countries in the world, the English language is used as the language of business, commerce, and technology. English is now an effective medium of international communication. However, it is the written English which is not systematically phonetic, that causes difficulties to non-native speakers. 1. Which language is used as the language of aviation, international sport and pop music? 2. Why is English an important foreign language used in many countries? 3. What difficulties may learners of English be confronted with? Why? 4. Name three countries in which English is spoken as a first language. 5. As a mother tongue, why does English rank second only to Chinese?

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