Câu 1: Xác định và kể tên các quốc gia ở bắc mĩ, khu vực nào tập trung đông dân nhất, khu vực dân cư thưa thớt nhất ở Bắc? Câu 2: Những thành tựu nổi bật của nền kinh tế Bắc Mĩ? Câu 3: Đới lạnh có dân cư thưa thớt vì sao?

các bạn giúp minh làm bài này với

Giúp mình với các nhà bác học ơi

Bài 2: rút gọn phân thức và tính giá trị của phân thức thu đc tại x=48 A = $\frac{x³+x³-6x}{x³-4x}$

Cho tam giác ABC vuông tại B , tia phân giác góc C cắt AB ở D . Từ D kẻ DE vuông góc AC . Chứng minh : a) DE = DB b) DA lớn hơn DB c) DE cắt BC tại F , Cd cắt AF tại I . Chứng minh : CI vuông góc AF Các bạn giúp mình câu c với ạ

Choose the word whose stressed pattern is pronounced differently from the others. A: historic B: physical C: aquatic D: botanical 17 Choose the best answer A, B, C or D to complete the sentence. Question 8: This river has been polluted ________ aluminum. A: with B: at C: within D: without

cho hai tam giác đều ABC à A'B'C' có hai đường cao AH à A'H'. Biết AH=A'H' Chứng minh tam giác ABC = A'B'C'

ÌNH TAM GIÁC ABC CÓ DIỆN TÍCH LÀ 60CM2 MN LÀ TRUNG ĐIỂM CỦA AB AC TÍNH HÌNH THANG MNBC giải theo cách cấp 1

1. Many people _______for posting false information on the Internet. * A. fined B. have fined C. are fined D. was fined 2. I still can’t believe it! My bicycle _______ last night. * A. was stolen B. was stealing C. stolen D. stole 3. Let’s go ahead and do it now. Nothing _______ by waiting. * A. will be accomplished B. accomplished C. has accomplished D. accomplishes 4. “When _______?” - In 1928. * A. penicillin was discovered B. did penicillin discovered C. was penicillin discovered D. did penicillin discover 5. We can’t go along here because the road is _______. * A. been repaired B. being repaired C. repaired D. repairing 6. More than 50 films _______ in HCM city since June. * A. were shown B. had been shown C. have been shown D. have shown 7. The instructions to prevent the disease from spreading _______ precisely. * A. must follow B. must followed C. must to be followed D must be followed 8. When I was a high school student, I _______ a scholarship. * A. used to award B. use to be awarded C. use to award D. used to be awarded 9. Mary _______ that the plan will be changed. * A. has told B. has just been told C. has been just told D. had been just told 10. Many species of rare animals _______ with extinction. * A. is endangered B. are in danger C. threaten D. are threatened 11. The donations ________to the pandemic areas to help the people there to overcome difficulties. * A.are going to send B. are going to be sent C. will send D. are sending 12. The boy donated his saving money to help the poor. * A. The boy’s saving money donates to help the poor. B. The boy’s saving money was donated to help the poor. C. The boy’s saving money is donated to help the poor. D. The boy’s saving money donated to help the poor. 13. The girl cleans the room every day. * A. The room every day is cleaned. B. The room is every day cleaned. C. The room is cleaned by the girl every day. D. The room is cleaned every day by the girl. 14. Nobody violates the regulations of preventing the disease. * A. The regulations of preventing the disease is not violated. B. The regulations of preventing the disease are not violated. C. The regulations of preventing the disease are not violated by somebody. D. The regulations of preventing the disease are not violated by nobody. 18. A new hospital/ been/ build/ Covid-19 patients / local volunteers. * A. A new hospital by local volunteers have been built for Covid-19 patients. B. A new hospital have been built for Covid-19 patients by local volunteers. C. A new hospital has built for Covid-19 patients by local volunteers. D. A new hospital has been built for Covid-19 patients by local volunteers. 19. Their/ complaints/ should/ send/ the head office/. * A. Their complaints should send to the head office. B. Their complaints should be sent to the head office by people. C. Their complaints should be sent to the head office. D. Their complaints to the head office should be sent. 20. Getting together/ crowded places/ ban/ everywhere/ Vietnam/ now/ * A. Getting together are being banned in crowded places everywhere in Vietnam now. B. Getting together in crowded places is being banned everywhere in Vietnam now. C. Getting together in crowded places everywhere in Vietnam is banning now. D. Getting together in crowded places are being banned everywhere in Vietnam now.

4/5 kg = ........g Giúp mình nhanh nhanh nha !