корень квадратный из 4 дробь 3х-17 равен 1/2

Серед усiх чотирицифрових чисел, добуток цифр яких дорiвнюе 27, Андрiйко знайшов найбiльше та найменьше.Потiм додав iх i отримав суму.......Яку???

3-й член арифметической прогрессии ранен 7, а 9-й член -18. Найдите 1-й и 6-й член

решить цепочки, и в случае если реакция не идет, объяснить почему

1) Cu + HNO3 (р-р) ->

2) Zn + HCl (р-р) ->

3) Cu + H2SO4 (конц) ->

4) Hg +H2SO4 (конц)->

5) ZnO + Al2O3 ->

6) HCl + Al2O3 ->

7) NaOH + Al2O3 ->

8) HNO3 + Al2O3 ->

9) Al(OH)3 + KOH ->

10) Al(OH)3 + HCl ->

Вставьте артикль, там, где необходимо. 1. This is … new house. 2. ... house is big and comfortable. I like it very much. 3. My brother is ... doctor. He is … good doctor. 4 … doctor advised me to take the pills every day. 5. What the building is this? This is … library. … library was here in 1955. 6. It is … hot day. … sun is in … blue sky. 7. When you write … letter, you take … piece of … paper and … pen. 9. Three men came to … New York for … holiday. 10. Alice likes to stay at … very large hotel and takes … room there. 10. In … small town there was … man who had … parrot. 11. Please, open … room 12. 2. My friend Ann is … good student. 2. “Is Kate … teacher?” “No, she is … doctor.” 3. This is … room. … room is light. 4. This is … cup. It’s … red cup. … red cup is on … table. 5. Please give me … pen and … pencil. 6. Am I … teacher? 7. This cup is not … red. It’s … yellow. 8. This is … red cup and that’s … yellow cup. 9. Bess is my … friend.