Cmr: a. x^2-x+1>0 vs mọi số thực x b.-x^2+2x-4<0 vs mọi số thực x

Cho góc nhọn xoy. Trên tia ox lấy điểm a, trên tia oy lấy điểm b sao cho oa=ob. Trên tia ox lấy điểm c, trên tia oy lấy điểm d sao cho oc=od a)chứng minh ad=bc b)gọi e là giao điểm ad và bc. Chứng tg aec = tg bed

Cho tam giác ABC nhọn, kẻ AH vuông góc BC. Tính độ dài BC biết AB bằng 13cm, AC bằng 9cm, AH bằng 5cm( Kết quả làm tròn đến số thập phân thứ nhất)

Em hãy nêu cảm nghĩ về một trò chơi dân gian ngày tết

IV. Read the passage and choose the correct answer My name is John, and this is my story. Last year just before Christmas my family and our cousin and uncle and aunt decided to go to Perth for holiday. We went in two cars but when we were about halfway there my uncle wanted to turn round and come back. He said it was too far, and it was terribly hot too, one day it was 480C . Even at night it was really hot. Anyway, what we decided to do was to drive back about 160 km to a place where the train went through. Then we put both cars on the train and we all went to Peth by train. That was fun. It was a good train. We had a good time in Perth but we had to cut our holiday short. You see, while we were there my grandmother (my mother’s mother) in Melbourne died. Most of us flew back but but my Dad and my uncle came on the train with the cars and then had to drive back to Melbourne from Port Pirie. It was a really strange holiday because nothing went the way we planned it. 0. When did John’s family go to Perth? A. before Christmas B. before Easter C. before Thanksgiving D. before the New Year 1. Why did John’s uncle want to come back? A. Because it was too hot B. Because it was too far C. Because he was to tired. D. Both A and B. 2. In the end john’s family went to Perth……………………. A. by train B. by coach C. by car D. by plane 3. Who died when John’s family were on holiday? A. his mother’s father B. his mother’s mother C. his father’s mother D. his father’s father 4. most of John family came back…………………… A. by train B. by ship C. by plane D. by car 5. Who in John’s family had to go by train and car to Melbourne? A. his father B. his uncle C. his parents D. his father and uncle

Diện tích hình chữ nhật là 16.2 cm vuông . Biết chiều dài gấp 1.25 lafn chiều rộng . Tính chu vi hình chữ nhật (Trình bày chi tiết )

trước đại dịch covid 19 toàn đảng toàn dân toàn quân chung tay dập dịch. Thì một số người quay lưng lại lợi dụng vào dịch để trục lợi bất chính. Em hãy viết một bài văn tỏ rõ thái độ của mình đối với những người thờ ơ vô cảm đó

chia động từ 1.john(have)...........a ca accident last wrrk.He(drive).........down the street when suddenly a lorry(hit).......his car from behind

Mình hỏi các bạn tại sao khi tác dụng lực vào vật khác thì sẽ có phản lực? (Không theo định luật 3)

Nêu nội dung, nghệ thuật và tại sao là câu hỏi tu từ của câu thơ "Sao anh không về chơi thôn Vĩ" ?