Giúp mik phần 3,4 với <3 Thanks !!! Chiều nay mik phải nộp rồi :((

Bài 1 a)cho a+b+c=d CMR a^3+b^3+c^3-d^3=3(c-d)(ab+cd) b)cho a+d=b-c CMR a^3-b^3+c^3+d^3=3(a-b)(ab+dc) moi nguoi giup minh voi a minh dang can gap

Tìm các số nguyên x để các phân số sau có giá trị là một số nguyên và tính giá trị ấy C=4x-6/2x+1

Mark the letter A, B,C or D on your answer sheet to indicate the words OPPOSITE in meaning to the undelined words in each of the following questions. Question 11: Our teacher encourage us to use a dictionary whenever we are unsure of the meaning of a word. A. motivates B. discourage C. famous D. unknown Question 12: The majority of children in my village go to the boarding school and see their parents at the weekend. A. maximum B. minimum C. ethnicity D. minority Mark the letter A, B,C or D on your answer sheet to indicate the correct answer to each of the following questions. Question 13: When the boy _______the car, he was badly injured. A. is hit by B. was hit by C. hit D. was hitting Question 14: The little girl asked what ______to her friend. A. has happened B. happened C. had happened D. would have happened Question 15: The lecture last night didn’t know what he was talking about, but if Dr.Mason ______I would have listened carefully. A. lectured B. had been lecturing C. was lecturing D. would lecture Question 16: He seemed _______on the topic and asked the teacher a lot of question. A. fond B. interested C. keen D. fall Question 17: She bought the book ____she had heard it was good. A. due to B. due to the fact that C. so D. because of Question 18: The first question must _______before you attempt the others. A. have answer B. answer C. to answer D. be answer Question 19: What would you like to eat? I don’t mind. ______- whatever you’ve got. A. something B. anything C. nothing D. any food Question 20: ______are aware that a language becoming extinct does not necessarily mean that people who spoke it have all died. A. Lingustic B. linguists C. language D. lingual Question 21: My father still hasn’t really ________the death of my mother. A. tooked after B. taken after C. gone off D. got over Question 22: She is ambitious and she wants to_____more responsibilites. A. take in B. take on C. get on D. get up

Mark the letter A, B,C or D on your answer sheet to indicate the word whose underlined part pronounced differently from that of the rest in each of the following questions. Question 1: A. mature B. adventure C. culture D. nature Question 2: A. admired B.judged C. waved D. presented Mark the letter A, B,C or D on your answer sheet to indicate the word whose underlined part pronounced differently from that of the rest in each of the following questions. Question 3: A. cancer B. manage C. patient D. prepare Question 4: A. experience B. generosity C. enviroment D. imagination Mark the letter A, B,C or D on your answer sheet to indicate the underline part that needs correction in each of the following questions. Question 5: Nam asked mai what can he do to help her. A. asked B. can he C. to help D. her. Question 6: Your friends went to your native village last week, weren’t they? A. your friends B. your native C. last week D. weren’t they Question 7: Nam suggested practice English in class as much as possible. A. suggested B. practice C. in D. as much as Question 8: Because of tall, Mai can reach the book on the shelf. A. tall B. reach C. on D. shelf Mark the letter A, B,C or D on your answer sheet to indicate the words CLOSEST in meaning to the undelined words in each of the following questions. Question 9: for over 26 years, he was distributed thousands of dollars every Christmas to the needy in public places. A. handed out B. handed off C. handed on D. handed in Question 10: She was a devoted teacher. She spent most of her time teaching and taking care of her students. A. polite B. precious C. honest D. dedicated Mn giúp e vs ạ

giúp mình bài 4 với chân thành cảm ơn các bạn đã giúp mình

She is bored _____ getting up early. A. with B. in C. of D. to

bạn nào biết giải không giúp mình với

-5/9 × -6/13 + 5/-9 × -5/13 - 5/9

Cho tam giác ABC có trung tuyến AM.Goik I là trung điểm AM,BI cắt AC tại D . CM AD=1/2DC