Tính nhanh a)A=(6^2+7^2+8^2+9^2+10^2)-(1^2+2^2+3^2+4^2+5^2) b)B=(2^2+1)(2^4+1)(2^8+1)(2^16+1) c)C=(5^2+1)(5^4+1)(5^8+1)(5^16+1)(5^32+1)

Cho hình thoi ABCD có AB = AC. Kẻ AF vuông góc với DC, AE vuông góc BC: a) Chứng minh ΔAEF đều b) Cho AB = 4cm. Tính AC và BD.

I. Complete the sentences with both the affirmative and negative forms of the verb bé 1.Out mother ________ in the kitchen 2.I ________ hungry 3.We ________ in class now 4.My motorbike ______ new 5.My parents _________ from Manchester 6. I ________ 23 years old 7. It _______ very cold today

Oxit chứa 40% oxi về khối lượng và trong một oxit nguyên tố chưa biết có hoá trị II. Oxit có công thức hoá học là: * MgO FeO CuO ZnO

Chia động từ trong các câu sau theo thì hiện tại đơn 1) I ( bake) …………………………….cakes. 2) You ( work) …………………………….in an office. 3) We ( take) …………………………….pictures of birds. 4) They ( talk) …………………………….about cars. 5) He ( think) …………………………….about school. 6) She ( play) ……………………………. soccer. 7) It ( rain) …………………………….here a lot. 8) I ( like) …………………………….chocolate. 9) He ( like) …………………………….chocolate. 10) You ( watch) …………………………….movies. 11) She ( watch) …………………………….movies. 12) The babies ( cry) ……………………………. every night. 13) The baby (cry) …………………………….every night. 14) I ( fly) …………………………….to Belize every year. 15) My father ( fly) …………………………….to Belize every year. 1) I (be) ____________________ sixteen years old. 2) Tommy (live) ___________________ at 107 Pine Lane. 3) Juana (cook) ______________________ dinner for her family. 4) They (eat) ________________________ lunch at 12:00. LeHuong 5) Nina (take) ________________________ medicine when she is sick. 6) I (like) _________________________ chocolate. 7) He (drive) _______________________ a nice car. 8) We (want) _____________________ to see a movie tonight. 9) Mr. Anderson (teach) _____________________ chemistry at Hill High School 10) They (study) ______________________ English at school. 11) I (want) ______________________ to go home now. 12) Bill and Calicia (drive) ______________________ to the mountains every year. 13) We (eat) ____________________ pasta once a week. 14) It (snow) _________________ here in December. 15) When Dax (take) ___________ a shower, he (wash) __________ his hair with shampoo.

Complete the sentences with your own ideas. Use a relative pronoun. 1 like meeting people. kho have travelled widely 2 lenjoy parties.which go on till dan. 3 lavoid going to restaurants. 4 Most of my friends are people. 5 Inever watch films. 6 My favourite films are those. 7 lfeel sorry for students.. 8 My best friend is someone. 9 I'm going to buy a phone.. 10 Iwish I had a job..

Giải thích rõ ràng nhé Xin cám ơn :Đ 1. If she had come to the party last night, she ......................... him. A. could meet B. could have met C. can meet D. had met 2. ..................... where to go, I stopped to ask for direction. A. As not knowing B. Can't know C. Can't find D. Couldn't find 3. John together with his friends ............. that story. A. likes B. like C. liked D. liking À cho mình xin các phần về sự hòa hợp giữa S với V 4. ................... words are noun, adjective, adverb, verb. A. Functional B. Important C. Rhythm D. Contented 5. The police .......................... to find thieves. A. are researching B. having researched C. doing D. researched 6. I'm able to lift that box. -> I'm ........................................................ cho mình xin cấu trúc

Tranh hàng trống có mấy bảng in

c. 7 8/(1000 ) và 7 6/(1000 ) lưu ý:7.8 chứ ko phải 78 7.6 cũng như v

Bài 1: Phân tích đa thức thành nhân tử a)3y^2 (x-7)-9y(7-x) b)3x(x-2)-6x+12 c)25x^4-49 d)25x^2-y^2-4x-4 Bài 2: a) Chứng minh rằng (5n-2)^2-(2n-5)^2 luôn chia hết cho 21 với mọi . b) Cho biết a^2+b^2=1-2ab và a>0,b>0 . Tính giá trị của biểu thức: C=a^3+b^3+3ab c) Chứng minh biểu thức không phụ thuộc vào biến x. T=(x^2+x+1)(x^2-x+1)(x^4-x^2+1)-x^8-x^4