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Cho a/b = c/d . chứng minh : 1. a-c /a+c = b-d / b+d 2. a / a+c = b / b+d 3. a / a-c = b / b-d
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I. Fill in each space in the following passage with one suitable word. The most highly motivated people in our world are often (1) _____who are already very successful. Their previous success pushes them on to bigger and better things, to search (2) _____new challenges. They know that opportunities only come with (3) _____and that experience doesn’t just happen – they have to look for it. They develop (4) _____a thirst for knowledge and a love of adventure. They know that it is important to do things now and not put them (5) _____till tomorrow. Successful people are keen (6) _____experience the richness of our cities, and the variety of our people. They are the ones (7) _____ski down the most dangerous slopes, who dive under the sea and who sail (8) _____the world. They want to feel new emotions, take on new ideas and learn new skills, but they (9) _____that all this requires a high level of self – motivation. It is important to remember all this in (10) _____ to achieve greater success in all areas of your life, such as sports, your career, studies and hobbies.

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