Hòa tan 40 gam lưu huỳnh trioxit vào cốc nước, sau phản ứng thu được 400 ml dd B. a. Tính nồng độ mol của dd B? b. Hòa tan 24 gam đồng(II) oxit vào B, sau khi phản ứng xảy ra hoàn toàn thu được dd D. Tính nồng độ mol của chất có trong dd D?

4. The company (is moving/ moves) its offices to a bigger building next month. 5. John (gives/ is giving) a lecture on social media at university every Wednesday. You should come. 6. Sally (always interrupts/ is always interrupting) me when I speak. It’s so irritating. 7. Can you help me with this exercise or (are you being busy/ are you busy)? 8. I (hate/ am hating) people who never really listen to what you saỵ. XII. Put the verbs in the correct form (present simple/ present continuous tense). 1. I’m in New York because I (study) …………………. English at a language school. 2. At the moment Linda (lie) …………………. on the floor. 3. I usually (work) …………………. as a teacher. 4. I hate living in Hue City because it always (rain) …………………. there. 5. I am sorry I can’t hear what you (say) …………………. because everyone (talk) …………………. so loudly. 6. Jimmy (currently write) …………………. about his adventures. 7. (you want) …………………. to come over for dinner tonight? 8. A famous company in this country (make) …………………. the delicious chocolate. 9. Look, I (have) …………………. two tickets for the film. 10. Look, I (hold) …………………. two tickets for the film. 11. Compaq (make) …………………. computers but it (not make) …………………. cars. 12. At present, the yen (fall) …………………. against the dollar. 13. Computers (become) …………………. more and more popular these days. 14. Everyone (need) …………………. money. It is very necessary. 15. This milk (not taste) …………………. fresh. 16. This afternoon I (see) …………………. my doctor about my health. 17. How is your cold today? It (sound) …………………. slightly better than yesterday. 18. He normally (read) …………………. all the Harry Potter books, but right now I (think) …………………. he (read) …………………. something else. 19. It is strange that people (take) …………………. some movies so seriously. 20. What (your brother, do) …………………. for a living? - Well he is a market consultant.

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Cho tứ giác ABCD ngoại tiếp đường tròn (O). Gọi M, N, P, Q lần lượt là các tiếp điểm của (O) với AB, BC, CD, DA. Chứng minh rằng các đường thẳng NP, MQ, BD đồng quy.

Cali : đói bụng tone xanh NL : ai chat với tôi đi vừa chán+đói bụng =="

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Tính bằng cách thuận tiện nhất: 19/4+37/100+1/8+132/25+5/2+37/12

Giúp mình câu này này với giải chi tiết giúp mình mình cảm ơn