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maikieuhanhdl
2 năm trước
Trong một lớp 60% số học sinh giỏi là 9 em. a) Tính số học sinh giỏi của lớp. b) số học sinh khá bằng 80% số học sinh giỏi. Tìm số học sinh khá của lớp. c) Biết lớp chỉ có học sinh giỏi và khá. Tìm tổng số học sinh của lớp.
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Hurricanes, cyclones, and typhoons are all the same weather phenomenon; we just use different names for these storms in different places. In the Atlantic and Northeast Pacific, the term "hurricane" is used. The same hype of disturbance in the Northwest Pacific is called a "typhoon" and "cyclones" occur in the South Pacific and Indian Ocean. The ingredients for these storms include a preexisting weather disturbance, warm tropical oceans, moisture, and relatively light winds. If the right conditions persist long enough, they can combine to produce the violent winds, incredible waves, torrential rains, and floods we associate with this phenomenon. In the Atlantic, hurricane season officially runs June 1 to November 30. However, while 97 percent of tropical activity occurs during this time period, there is nothing magical in these dates, and hurricanes have occurred outside of these six months. l. Which the name is used for very big storms in Northwest Pacific? 2. Where is the name "cyclones" used? 3. What are the features of the severe storms which occur within a long time? 4. When do hurricanes often occur? 5. Is it possible that hurricanes can occur even when it is not hurricane season? 6. How many percents of tropical activity occurs outside of these six months from June to November ?

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