Ответ учителя по предмету Математика
1. первые две грани: площадь каждой : 9*11=99 кв м
2. следующие две грани: по 9*24=216 кв м
3. последние две грани: по 11*24=264 кв м
площадь поверхности всего параллелепипеда: 2*(99+216+264)=2*579=1158 куб м
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Желательно с объяснениями и полное решение, заранее спасибо! )
При каких значениях x значения функции y=2cos(x/2-п/4) положительны?