Вопрос школьника по предмету Математика
В треугольнике ABC ВL-биссектриса,т.О-пересечение биссектрис,угол C=50 градусов,найти угол АОВ
Ответ учителя по предмету Математика
угол С равен 180-(А+В)
сумма углов А+В=130 градусов
Угол АОВ равен 180-(А+В)/2 (т.к.АО и ВО — биссектрисы)=180-65
АОВ=115 градусов
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Вот текст
The Animal World of Russia
Russia is large and rich not only¹ in its territories — moun¬tains, seas, rivers and forests. The plant and animal worlds of our country are very rich too. We’ve got lots of different animals and birds, trees and flowers. You can find wolves and bears, foxes and hares, squirrels and hedgehogs in our forests. Large and powerful elks live there too. Reindeer live in the north of Russia, tigers in the Far East.
All Russian people know the names of these animals. You can
meet them in Russian fairy tales too. Strong bears, clever
hares, sly² foxes are favourite heroes³ of tales and fables
а)Al + O2 →t Al2O3;
б)H2O2 →MnO2 …+….;
в)ZnO + C →t Zn + CO;
г)CH4 + O2 →t CO2 + H2O.
во второй на 1546кг меньше,
а в третий на 1,77т меньше чем во второй и первый деньвместе.
Сколько тонн муки было израсходовано за эти три дня