найдите тангенс угла В треугольника АВС,изображенного на рисунке. - №11864989

найдите тангенс угла В треугольника АВС,изображенного на рисунке.
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  porfiriorobbins
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из сколько это будет?
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  ayla95
- 6 лет назад
- 0
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Z1=1-I и z2=3+4i.
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The main cause of extinction is the destruction of habitats. A habitat contains all that a living thing needs to survive: space, light, water, food and shelter. Habitat destruction may occur when vegetation is cleared for agriculture, forestry, cities, mines or roads. It can also occur when swamps are drained or rivers are damped to store water. About 50 species of introduced animals live in the wild in Australia. These animals prey on native animals or compete with them for food and shelter.
Today we have a far greater understanding of the threats our wildlife faces than did the early settles. Yet still we have created added treats such as urban and industrial development, pollution, and pet and fur trade. Parrots, for example, are illegally transported overseas. Often the parrots cannot adapt to the new environment and die.
People are the only animals with the power to save endangered species. But, why save species? Without a variety of species, the earth may not be inhabitable by humankind. Plants and animals help to maintain the chemical balance of the atmosphere. Forests help to regulate water supplies. Plants and animals help to make soil. They provide food and control pests and diseases. They also provide a constant source of wonder and enjoyment.

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