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loga2397
2 năm trước
Tìm a, b biết B(x)=a(x-1)^4 - 2020x+b với nghiệm là x=1 và x=2
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Stamp collecting is the collecting of postage and relate objects, such as envelopes or packages with stamps on them. It is one of the world's most popular hobbies, with estimates of the number of collectors ranking up to 20 million in the United States alone. Many casual collectors enjoy accumulating stamps without worrying about the tiny details, but the creation of a large or comprehensive collection generally requires some philatelic knowlege. This is especially important for those who intend to spend large amounts for stamps. Stamp collectors are an important source of income for some small countries who create limited runs of complicated stamps designed mainly to be bought by stamp collectors. The stamps produced by these countries far exceed the postal needs of the countries . Some collectors, observing the generally rising prices of rare stamps, have taken to philatelic Investment, Rare stamps are among the most portable of clear investments, and are easy to store. They offer an attractive to art, other collectible investments, and precious metals. Đoạn 4 What would happen if there were a serious nuclear accident ? And an accident must be invitable- sooner or later . Huge areas would be evacuated, and they could remain contaminated with radioactivity for years. If it happened in your area you wouldnt's get a penny in compensation . No insurance company covers nuclear risks. There are accidents. If the nuclear industry didnt's keep them quitet there would be a public outcry. Radioactivity causes cancer and may affect future generations. Next, nuclear waste. There is no technology for absolutely safe disposai. Some of this waste will remain active for thousand of years. Is that what you want to leave your children? And their children's children? A reactor only lasts about 25 years. By the year 2000 we'll have 'retired' 26 reactors in the Uk. Đoạn 5 The scarcity of tigers and A frican elephants is more and more serious. They are endangered because poachers hunt them in order to sell and elephant ivory. At least 4,000 elephants are killed each year in order to meet the global demand for ivory, which is used to make carvings, jewelry and other products although it is illegal to sell ivory since 1989 anywhere. '' Americans should be aware that there is still a problem with elephant poaching and loss to the illege ivory trade, '' Ginette Hemley, Fund's vice president for species consercation, told The Washington Post in September. And so our message is ''Don't buy it, and don't take that chance''. A Wildlife Fund report states that the United States seized 8,300 illegal ivory items between 1995 and 2002. Each week there are about 1,000 ivory auctions, the report said. As for tigers, their parts are used in traditional Chinese medicine. Tiger bones are used as a pain reliever in traditional medicine. Even tiger's are sold because some people in Asia think they are a good- luck charm - like a rabbit's foot in the United States. '' Part of our job is educstion,'' said Professor Dillon. ''The other part is law enforcrement. So we have more than more strategy.'' CÁC BN ƠI GIÚP TÔI GIẢI CÁI NÀY DỊCH SANG TIẾNG VIỆT NHA NHƯNG KO ĐC SAO CHEP TREN MẠNG MÀ TỰ LÀM NHÉ TRÂN THÀNG CẢM ƠN

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