CHo tam giác ABC cân tại A .Vẽ đường phân giác BD,CE. a, C/m BD=CE; b, C/M ED//BC; c, Biết AB =AC =6CM ;BC =4cm .Tính AD,DC,ED

Các bước và cách giải các dạng bài tập giải hệ phương trình hóa học

Tìm GTNN của các biểu thức : a, A= (x-1)(x-3)(x^2-4x+5); b, B= (x^2-x+6)(x^2+x+2); c, C=(x+8)^4+(x+6)^4; Tìm GTNN của biểu thức A= x^2-4x+1 / x^2

mấy bạn cho mình hỏi làm thế nào để thi tốt học kì 1 môn toán hình vậy mình đang rất cần , nếu bạn không phiền thì làm ơn giúp mình nhé

1.phân tích các đa thức sau thành nhân tử :
a, x^2+x+y^2+y+2xy;
c, -x^2+5x+2xy-5y-x^2;
d, x^2-y^2+2x+2;
e, x^2+2xz-y^2+2ty+z^2-t^2; 2.
2.ptdtstnt:
a, x^3-4x^2+4x-1;
b, x^3-3x^2+4x-2;
c, x^3-4x^2+5x-2

Tìm GTNN của biểu thức A= x^2-6x+10; B= 3x^2-12x+1; Tìm GTLN của biểu thức C= -x^2+2x+5; D= 4x-x^2; E = x.(x-3)(x-4)(x-7)

V.Choose the best option that best completes each sentence:1/. Ba told me that he was leaving for the capital _____________. A. tomorrow B. the following week C. tonight D. next Sunday2/. They asked me how many children_______________ . A . I had B. had I C. I have D. have I3/. Thu said she had been_____________ the day before. A. here B . there C. in this place D. where4/. They told their parents that they______________ their best to do the test. A. try B. will try C. are trying D. would try5/. She______________ me whether I liked classical music or not.8
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A. ask B. asks C . asked D. asking6/. He asked me who the editor of that book____________ . A. was B. were C. is D. has been7/. He wants to know whether I_____________ back tomorrow. A. come B. came C. will come D. would come 8/. I wonder why he______________ love his family. A. doesn’t B. don’t C. didn’t D. hasn’t9/ “I didn’t witness that accident.” A. He denied not having witnessed that accident. B. He denied having witnessed that accident.C. He denied not having witnessing that accident. D. He denied not had witnessed that accident.10/ “Would you like to join our team?”, he said.A. He said to me would you like to join our team. B. He told me if I would like to join their team.C . He invited me to join their team. D. He asked me if I would like to join our team11/ “You cheated in the exam.” The teacher said to his studentsA. The teacher insisted his students on cheating in the exam.B. The teacher prevented his students from cheating in the exam.C. The teacher advised his students to cheat in the exam.D. The teacher accused his students of cheating in the exam.12/ “Don’t touch that flower.” the old lady said to the boy.A. The old lady wanted the boy not to touching that flower.B. The old lady insisted the boy on touching that flower.C. The old lady warned the boy against touching that flower.D. The old lady congratulated the boy on touching that flower.13/ “Let’s go on a walk holiday!” said Jane.A . Jane suggested going on a walking holiday. B. Jane wanted us to go on a walking holiday.C. Jane invited us to go on a walking holiday. D. Jane allowed us to go on a walking holiday.14/ " Don't forget to give the book back to Mary," he said to me.A . He reminded me to give the book back to Mary.B. He reminded me to forget to give the book back to Mary.C. He advised me to give the book back to Mary.D. He advised me to forget to give the book back to Mary.15/“If I were you, I would take the job”, said my friend.A. My friend was thinking about taking the job. B. My friend insisted on taking the job for me.C. My friend advised me to take the job. D. My friend introduced the idea of taking the job to me

Cho mình hỏi 1 chút : có phương pháp nào để học tốt tiếng Anh lên không ( ý mình là làm bài tập nâng cao , còn bt cơ bản thì mình làm được ) rất mong được sự giúp đỡ của các bạn và thầy cô .Cảm ơn mn nhiều

cho hình bình hành ABCD .Gọi O là giác điểm của 2 đường chéo , gọi E là 1 điểm thuộc cạnhAB, F là giao điểm của EO và CD, vé EG //AC(G thuộc BC), FH//AC(H thuộc AD).Cm a, EG=HF; b, HE//FG