cho tam giác ABC cân tại A kẻ AH vuông góc với  BC (H thuộc B,CK vuoong góc AC .chứng minh rằng  a)HB=HC b)góc BAH =góc CAH

Câu 6: It was very cold. ______, they went for a walk in the park. A. Although B. Because C. However D. Since Câu 7: Linda is the girl ______ is wearing a blue hat. A. who B. whom C. which D. what Câu 8: If I you study hard, you ______ the exam. A. will pass B. didn’t pass C. would pass D. won’t pass. Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions. Câu 16: It is a pity that I can’t do this exercise. A. I wish I can’t do this exercise. B. I wish I can do this exercise. C. I wish I could do this exercise. D. I wish I couldn’t do this exercise. Câu 17: Without your help, I wouldn’t have succeeded. A. If you had helped me, I wouldn’t have succeeded. B. Had it not been for your help, I would have succeeded. C. Had it not been for your help, I wouldn’t have succeeded. D. If you didn’t help me, I wouldn’t have succeeded. Câu 18: Mr. Pike used to go fishing a lot. A. Mr. Pike never went fishing in the past. B. Mr. Pike often goes fishing a lot. C. Mr. Pike is used to going fishing a lot. D. Mr. Pike doesn’t go fishing any more.

1 cano chạy trên 1 khúc sông . Xuôi dòng 20km/h rồi ngược dòng 18km/h hết 1h 25 phút Lần khác nó đi xuôi dòng 15km/h rồi ngược dòng 24km/h hết 1h30 phút. Tính vận tốc dòng nước và vận tốc riêng của cano biết rằng vận tốc không đổi

tam giác béc mu đa chiếm bao nhiêu phần trăm quần đảo bahamat

Em không hiểu câu này 95,87kg=...... tạ

Hai vật có khối lượng m1=1kg,m2=3kg chuyển động với vận tốc v1=3m/s, v2=1m/s . Biết v1 vuông góc với v2 Tính độ lớn động lượng của hệ hai vật

Giúp mink - huhu a)-(2789-435)+(1789-1435) b) -(-2020)+36.41-36.(-59)+(-2020) c) -75.(18-65)-65.(75-18) d) (157.57-99.57-57* ) :57+57 P/s : dấu sao là ngũ hai trong câu d ạ !

1 Don’t stand __________ the television. I can’t see! a) on b) in front of c) above 2 Come and sit __________ me so that I can hear you better. a) beside b) under c) on 3 From the plane we could see people in the fields __________ us. a) beside b) below c) above 4 You’ll have to turn round to see it. It’s __________ you. a) behind b) in front of c) over 5 The dead man was lying __________ the ground. a) behind b) in front of c) on 6 Careful you don’t scratch the table! Better put a cloth __________ it. a) above b) beside c) over 7 It’s dark where the road goes __________ a railway bridge. a) on b) behind c) under 8 He looked up at the ceiling __________ him. a) above b) under c) below 9 You can sit __________ that chair. Nobody is sitting there. a) in front of b) on c) above 10 The police car came first. The president was in the car __________ it. a) behind b) on c) under

cân x - 1 = x - 3

Giải giúp mik với, từ câu 18 đến câu 21