Cho a, b, c là các số thực thỏa mãn: a^2 +b^2 +c^2 =ab+bc+ca . Chứng minh rằng: a=b=c P/S: Giải thích kỹ cách làm cho mình hiểu với!

Bài 3 : Cho hình thang ABCD có góc A = góc D = 90 độ và AB = AD = 3 cm , DC = 6 cm . Tính các góc còn lại của hình thang. Bài 4 : Cho hình thang ABCD có ( AB // CD ) có góc B – góc C = 24 độ , góc A = 1,5 góc D . Tính các góc của hình thang. Bài 5 : Cho tam giác ABC vuông cân tại A . Trên nửa mặt phẳng bờ BC không chứa A , vẽ BD vuông góc BC và BD = BC. a. Tứ giác ABCD là hình gì ? b. Biết AB = 5cm , tính CD.

Viết lại các câu sau dưới dạng so sánh hơn và so sánh nhất 1 today is hotter than yesterday Yesterday was ……… 2 no one in her team is more beautifull than salim Salim is …………….. 3 no house in my city is higher than his house His house is ……………. 4 lan is the most interlligent in her class No one in her class………….. 5 if she reads many science books,she will have much knowledge The more ………………… 6 if kien wants to pass the exam easily,he will study harder The more easily…………………… 7 this house is very beautiful. It is expesive ,too Bj is ………………….

Write 1995^1995 as a sum of natural number. The remainder when we divide the sum of the cubes of those natural numbers by 6 is A. 3 B. 5 C. 8 D. 9

Ko làm ra giấy nhé ! Chỉ chấp nhận đánh máy !! Spam hay làm hời hợt = báo cáo Thực hiện phép tính: ( tính nhanh nếu có thể )

Mọi người giúp em với bài từ vựng khó quá

Complete the sentences with an appropriate form of the verb given. Use the past simple, present perfect, past perfect and past perfect continuous tenses. Use each tense at least once in each group of four sentences, but give alternatives where possible. 1. play a. We …..have played ….. 35 matches so far this season, so we’re all feeling pretty tired. b. After the match, she admitted that she …………………………………… badly. c. ……………….. you …………………………………… rugby or football at the school you went to? d. We …………………………………… really well all year, so it came as a big surprise when we were beaten by Wales last December. 2. make a. We …………………………………… the right decision in emigrating to Canada in the mid-1990s. b. Henson never thought about retirement. In fact, he …………………………………… a documentary film about the indigenous people of Chile when he died. c. A: When did you realise that you …………………………………… a mistake in joining the army? B: When I was posted to Afghanistan. d. Korean scientists believe that they ………………………………… a breakthrough in the fight against cancer by developing a technique for containing the disease. They reported their findings at the AAL conference in New York this week. 3. eat a. The couple described how they …………………………………… in the dining room when the explosion destroyed the hotel. b. My mother was a vegetarian, and as children we rarely …………………………………… meat. c. I …………………………………… prawns a few times before last week without any ill effects, but the ones I had at the restaurant made me very sick indeed. d. A: Would you like some of these cherries? B: Yes, please. I …………………………………… any fresh fruit for days. 4. run a. Over the last year I …………………………………… workshops on creative writing in twelve colleges and universities. b. She was breathing hard as if she …………………………………… c. She …………………………………… only two marathons before breaking the world record in the Pan-African Games. d. I was late for work so I …………………………………… most of the way.

A=4^5.9^4-2.6^9/2^10.3^8+.6^8.20

tÌM CHỮ STN n để 3n+29 chia hết cho n+3 tÍNH A;Bbiết: A=1/3.8+1/8.13+.....+1/33.38

Các bạn ơi cho mk xin công thức chi tiết của adjective-preposition