ABCD - ромб. угол B тупой. на стороне AD взята точка K, BK ⊥ AD. прямые BK и AC пересекаются в точке O, AC=2BK. найдите угол

Put in the artikls: a (an) or the 1)Stella takes care of people in hopital. She is ___ nurse. 2)When Ann was ill, we went to ____ hopital to visit her. 3)Excurse me, were is ____ town museum, please? 4)Would you like to be ____ actor? 5)we spent all our money because we stayed at ____ most expensive hotel in town 6)Ron writers articlex for a newspaper.He is ____ journalist

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Выделите корни и укажите их значение

При действии разбавленной серной кислоты на 25 г смеси магния и меди, выделилось 3,36 л газов. Какова массовая доля меди в смеси ?