Cho tam giác abc vuông tại a có sin C= $\frac{1}{cos B}$ . Tính tỉ số lượng giác của hai góc trên

Oxit cao nhất của 1 ng tố là R2O7. Hợp chất khí của R với H có tỷ khối so với H2 bằng 64. Xác định R ?

Làm giúp mình câu bc bài 1 thui nha

Tìm từ còn thiếu ở phần gạch chân: + no lon_ _ _ + str_ _ _ + exper_ _ _ _ _ + bee_ _ _ _ + gen_ _ _ _ _ _ _ Dịch nghĩa nữa nhé Nhanh lên, toi cần gấp

√(5x-6) + √(10 -3x) = 2x^2 -x-2

phân tích đa thức thành nhân tử bằng phương pháp dùng hàng đẳng thức

Cali chữ " NT2 Debaters " Chữ màu vàng Nền tím

Use present simple or present continuous

chỉ em với ạ..........................

21. The host asked Peter _______ tea or coffee. A. whether he preferred B. that he preferred C. id he prefer D. if he prefers 22. The mother asked her son _______. A. where he has been B. where he had been C. where has he been D. where had he been 23. “Please don’t tell anyone what happened,” Ann said to me. A. Ann said to me please don’t tell anyone what happened. B. Ann told me didn’t tell anyone what had happened. C. Ann said me not to tell anyone what happened. D. Ann told me not to tell anyone what had happened. 24. “Would you like to go to the cinema with me tonight?” he said. A. He invited me to go to the cinema with him that night. B. He offered me to go to the cinema with him tonight. C. He asked me if I’d like to go to the cinema with him tonight. D. He would like me to go to the cinema with him this night. 25. “Remember to pick me up at 6 o’clock tomorrow afternoon” she said. A. She told me to remember to pick her up at 6 o’clock tomorrow afternoon. B. She reminded me to pick her up at 6 o’clock the following afternoon. C. She reminded me to remember to pick her up at 6 o’clock the next afternoon. D. She told me to pick her up at 6 o’clock the next day afternoon. 26. “If I were you, I’d tell him the truth,” she said to me. A. She said to me that if I were you, I’d tell him the truth. B. She will tell him the truth if she is me. C. She suggested to tell him the truth if she were me. D. She advised me to tell him the truth. 27. “I’m really sorry for being late again,” said Ann. A. I felt sorry for Ann’s being late again. B. Ann was sorry for my being late again. C. Ann excused for my being late again. D. Ann apologized for being late again. 28. “How beautiful the dress you have just bought is!” Peter said to Mary. A. Peter promised to buy Mary a beautiful dress. B. Peter said thanks to Mary for her beautiful dress. C. Peter complimented Mary on her beautiful dress. D. Peter asked Mary how she had just bought her beautiful dress. 29. “Can I bring a friend to the party?” Nancy wanted to know. A. Nancy asked me if she could bring a friend to the party. B. Nancy wanted to ask someone to bring her friend to the party. C. Nancy knew that bring a friend to the party was good. D. Nancy wanted to invite her friend out and to the party. 30. She asked me, “How high is the church?” A. She asked me how high the church was. B. She asked me how high is the church. C. She asked me how high the church had been. D. She asked me how high the church is.