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cho a + b+c > 0 thỏa mãn a + b +c = 1 . Chứng minh rằng ab + bc + ca >= 1/3
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Tóm tắt đoạn văn sau thành 70 câu nhưng không được ghi lại hoàn toàn những câu trong đoạn văn ( sử dụng cấu trúc rút gọn ) The main elements required for survival are food, fire, shelter and water. Their order of importance will depend upon where you happen to be. In the desert water will head the list; in polar regions shelter and fire will be the main concerns. Ordering your priorities is the first step to survival. It takes a healthy person quite a long time to die of starvation, for the body can use up its stored resources, but exposure to wind, rain and cold can be fatal even in mild climates and death comes in only minutes in the icy waters of the poles. Food is rarely the first priority. Even in those places where it is difficult to find, there are usually other problems to face first. Shelter will often be the prime necessity in extremes of climate or temperatures such as in the frozen polar regions or in the baking deserts. The need for fire is closely linked. Water is something that most people in the modern world take for granted. They are so used to turning on a tap that until an extreme drought causes water rationing they seldom think about it. Yet the survivor at sea, or after a flood, though surrounded by water, may be desperate for drinkable water. And there are many places where, unless it rains, no obvious water is available. Although there could be other survival necessities to deal with, water is always universally important.

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