Cho tam giác vuông ABCD vuông tại A và B kẻ EF vuông góc AB biết AB = 12 và AF = 6 a) Chứng minh E là trung điểm DC b) Tính BC biết AD = 8 ( giúp em gấp với em hứa sẽ vote 5 sao )

a) (2x+3)^2-4x(x+3) Thực hiện phép tính

Câu 1. Cho biết Bo có 2 đồng vị: 10Bo và 11Bo. Nguyên tử khối trung bình là 10,81. Tính thành phần phần trăm số nguyên tử của mỗi đơn vị Giúp mình với

CẦN GẤP TRƯỚC 7H30 Ạ. GIÚP EM VỚI. EM CẢM ƠN

đại từ : ai đi đường ấy xa xa để ai ôm bóng trăng tà năm canh

a. Kể tóm tắt văn bản chuyện người con gái Nam Xương b.Viết đoạn văn trình bày cảm nhận của em về nhân vật trương sinh ( GIẢI + 5sao ) không sao chép nguyên văn bản trên google chỉ lấy ý

Kể về kỉ niệm vào một ngày Quốc tế Thiếu nhi mà em còn nhớ mãi. Y/c:Viết ra giấy NL:Múa chữ đi :)))

Tìm giá trị số nguyên P=5x+7/2x+1 Giúp tôi và

Identify the errors in the following sentences and correct them. 1/ We won't mind your (A) being late – (B) beside, it's (C) hardly your (D) mistake. 2/ (A) The whole report is (B) badly typed. (C) Moreover, it's (D) inaccurate. 3/ I'm not (A) astonish she (B) shouted at us! (C) How would we like (D) to be pushed into a wall? 4/ Nguyen is (A) everything we'd ever (B) want (C) in a man - brilliant, (D) fun and attractive. 5/ They just hope (A) that the money (B) goes to those (C) who are mainly in (D) needs. 6/ A doctor (A) with profession, this is his first (B) pleasure trip (C) into writing (D) for the theatre. 7/ She (A) views her life (B) like a spiritual (C) voyage towards a superior (D) understanding of her confidence. 8/ Trung was a (A) youthful sailor (B) on his first (C) sea (D) excursion. 9/ The (A) journey guide (B) pointed out the message (C) that runs round (D) the inside of the sports ground. 10/ (A) Supersonic airplanes can (B) go (C) more fast than (D) the speed of sound.

20. To be able to qualify as an interpreter, many years of intensive language study are required for non – native speaker. By the end of this year, Chen ………. English for three years, but he will still need more training and experience before he masters the language. A. will be studying B. has studied C. will have been studying D. has been studying 21. “May I speak to Dr. Paine, please?” “I’m sorry, he ………. a patient at the moment. Can I have you?” A. is seeing B. sees C. has been seeing D. was seeing 22. “When are you going to ask your boss for a raise?” “………. to her twice already! I don’t think she wants to give me one.” A. I’ve talked B. I’ve been talking C. I was talking D. I’d talked 23. “Do you think Harry will want something to eat after he gets here?” “I hope not. It’ll probably be after midnight, and we ……….” A. are sleeping B. will be sleeping C. have been sleeping D. be sleeping 24. “Paul, could you please turn off the stove? The potatoes ………. for at least thirty minutes. “I can’t. I’m feeding the baby.” A. are boiling B. boiling C. have been boiling D. were boiling 25. “Is it true that spaghetti didn’t originate in Italy?” “Yes. The Chinese ………. spaghetti dishes for a long time before Marco Polo brought it back to Italy.” A. have been making B. have made C. had been making D. make