Cho đường tròn (O) đường kính AB.trên Tia đối của tia BA lấy điểm C(C khác B).Kẻ tiếp tuyến CD với đường tròn (O) (D là tiếp điểm), tiếp tuyến tại A của đường tròn (O) cắt đường thẳng CD tại E. 1) CM: Tứ giác ADOE nội tiếp. 2) Gọi H là giao điểm của AD và OE,BE cắt đường tròn (o) tại K(khác B). CM:EHK=KBA

2. Cho phương trình : x2-2(m+4)x+m2+8m+15=0( m là tham số).

 Tìm m để phương trình có nghiệm x₁<x₂ thỏa mãn 3x₁ - 2x₂=15

1. _________ many times I tell him, he always forgets to pass on phone messages.
A. Wherever B. Whatever C. However D. Whenever
2. I disapprove __________ people smoking in public places.
A. with B. on C. at D. of
3. Our flight from Amsterdam to London was delayed __________ the heavy fog.
A. as a result B. on account C. because D. due to
4. It is __________ to translate each lesson into your language. This is not a good way to study English.
A. productive B. unproductive C. producing D. unproducing
5. A good clock always keeps __________ time.
A. certain B. accurate C. true D. serious
6. It seems that the world record for this event is almost impossible to __________.
A. meet B. compare C. beat D. balance
7. The soldier was punished for __________ to obey his commanding officer’s order.
A. refusing B. regretting C. objecting D. resisting
8. It is believed that she’ll be a billionaire by the time she __________ forty.
A. is B. was C. will be D. would be
9. Some of the passengers spoke to reporters about their __________ in the burning bus.
A. occasion B. happening C. event D. experience
10. __________ the rise is unemployment, people still seem to be spending more.
A. Nevertheless B. Meanwhile C. Despite D. Although
11. Their flat is decorated in a __________ combination of colours.
A. tasteful B. sweet C. delicious D. tasty
12. I wish you __________ stop interrupting me whenever I speak.
A. will B. would C. could D. might
13. The earthworm is a worm __________ in moist, warm soil in many geographic areas.
A. where is it found B. is found C. and found it D. which is found
14. - “I think you’ve taken my bag by mistake.” - “_________”
A. What a shame! B. Pardon. C. I’m so sorry. D. Have I?
15. - “May I have something to drink, please?” - “_________”
A. Yes, of course. Help yourself. B. Of course you may.
C. Why do you have to ask? D. You must help others too

Help mik nha!!
 

Câu 1: Các nguyên tố hóa học trong bảng hệ thống tuần hoàn hiện nay được sắp xếp theo chiều tăng dần:

          A. Nguyên tử khối                                                            B. Phân tử khối

          C. Điện tích hạt nhân nguyên tử                 D. Số electron lớp ngoài cùng