составьте графические формулы оксидов титана(2,3,4)​

Помогите в решении ионных уравнений 8 класс

упростить выражение (sin(3П/2+альфа)-sin(2п+альфа))/2 cos альфа sin(-альфа)+1

Помогите, в решебниках нет этого. Срочно! ВАРИАНТ I Task 1. Put the verbs in brackets into Present Simple or Present Continuous. 1. We ………………………….(to rebuild) our house. 2. The waiter…………………………… (to bring) the dessert. 3. She…………………….. (to look) for a new house to live in. 4. At present Lucy………………….. (to work) on her project. 5. How often ……………………(you/ to cook) lunch? 6. I ………………………(not/ to listen) to the radio very often. 7. Can you hear that? Somebody……………………….. (to sing) . 8. Hello! Where ………………………..(you/ to go)? 9. Ann…………………….. (to look for) a new job.. 10. She told me her address, but I…………………….. (not/ to remember) it. 11. 'What ………………………….(your parents/ to do)?' 'They are teachers.' 12. My brother usually ………………………….(to go) to work by train. 13. My sister Sonia …………………………..(to live) in London. 14. Can you cook? No but I …………………………..(to learn). 15. Can you hear those girls? What ………………………(they/ to talk) about? 16. ………………..(you to need) a ticket to see your mother play at the theatre? 17. Lucy is not in London at the moment. She……………….. (to stay) in Paris. 18. How is your father? Is he still ill? No, he ………………..(to get) better. 19. Let's go jogging. It ……………………(not/ to rain) at the moment. 20. The earth ………………………….(to go) round the sun. 21. Why ………………………….(you/ to look) at me like that? 22. She ………………………….(to prefer) coffee with milk. 23. Do not put the scissors away I ……………………..(to use) them. 24. Are you thirsty?.............................. (you/ to want) something to drink