В квадрат, сторона которого
равна 76 см, вписан другой
квадрат, вершины которого
являются серединами сторон первого квадрата, в этот квадрат вписан таким же образом другой квадрат, ит. д. (см. рис.).
Вычисли сумму площадей всех квадратов.
1.Сумма площадей всех квадратов равна?
Дополнительные во сторона третьего по порядку квадрата равна?
2. Площадь наибольшего квадрата равна?
3. Знаменатель равен?
Самая близкая -МЕРКУРИЙ
самая дальняя-НЕПТУН
46 миллионов-46000000
107 миллионов-107000000
147 миллионов -147000000
205 миллионов-205000000
741 миллионов-741000000
1 миллиард 350 миллионов -1350000000
2 миллиарда 75 миллионов-2750000000
4 миллиарда 45 миллионов-4450000000
4 миллиарда 44 миллиона -4440000000
70 миллионов -70000000
109 миллионов -109000000
152 миллиона- 152000000
249 миллионов-249000000
817 миллионов -817000000
1 миллиард 510 миллионов-1510000000
3 миллиарда-3000000000
4 миллиарда 55 миллионов -4055000000
7 миллиардов 38 миллионов -7380000000
We all know the world has its problems, particularly where the environment is concerned. But not too many of us know the details, and the stories behind those problems.
The poisoning of the world's land, air, and water is the fastest-spreading disease of civilisation. It probably produces fewer headlines than wars, earthquakes and floods, but it is potentially one of history's greatest dangers to human life on earth. If present trends continue for the next several decades, our planet will become uninhabitable.Overpopulation, pollution and energy consumption have created such planet-wide problems as massive deforestation, ozone depletion, acid rains and the global warming that is believed to be coused by the greenhouse effect.The seas are in danger. They are filled with poison: industrial and nuclear waste, chemical fertilisers and pesticides. The Mediterranean is already nearly dead; the North Sea is following. The Aral Sea is on the brink of extinction. If nothing is done about it, one day nothing will be able to live in the seas.Every ten minutes one kind of enimal, plant or insect dies out for ever. If nothing is done about it, one million species that are alive today will have become extinct twenty years from now.Air pollution is a very serious problem. In Cairo just breathing the air is life threatening- equivalent to smoking two packs of cigarettes a day. The same holds true for Mexico City and 600 cities of the former Soviet Union.Industrial enterprises emit tons of harmful substunces. These emissions have disastrous consequences for our planet. They are the main reason for the greenhouse effect and acid rains. An even greater environmental threat are nuclear power stations. We all know how tragic the consequences of the Chernobyl disaster are.People are beginning to realise that environmental problems are not somebody else's. They join and support various international organosation and green parties. If governments wake up to what is happening- perhaps we'll be able to avoid the disaster that threatens the natural world and all of us with it