Cho biểu thức P=x+1/x-1 - x-1/x+1 + 4/1-x^2 Rút gọn P Tìm x để P=2020 Tìm x nguyên để P nhận giá trị nguyên

cho hình thang ABCD có hai đường chéo AC và BD cắt nhau tại O.Biết diện tích tam giác AOD=18cm2 ,diện tích tam giác DOC=27cm2.Tìm diện tích hình thang ABCD.

Các anh cj zúp e 3 bài này zới ak. TOÁN 6 ak

tìm số nguyên x biết: |x-5|-3=|-6|

Mọi người soát lỗi hộ em Hi everyone, you can call me Thi and I'm 13 years old. I am currently studying at Quang Tien high school and I live in Sam Son city. I live in a happy family. My family has 4 people. Yes: my father, my mother, my brother and me. But I will soon have a younger sister and I have been waiting for this moment for a long time because I want a younger sister. My father is 45 years old and my mother is 37. Both have jobs while my brother is old and he is studying in Can Tho city. My family likes to watch TV together at night and since then, I can have the opportunity to know more about my parents and that makes me love them more and more. I'm a sports person so I like swimming, badminton or basketball and I'm good at badminton and swimming so I take the time to practice them. I often listen to music especially when I feel sad and lonely.

Ý nghĩa quan trọng nhất của sự ra đời Đảng Cộng sản Việt Nam vào đầu năm 1930? A: Chấm dứt sự khủng hoảng về con đường giải phóng dân tộc Việt Nam. B: Chấm dứt sự khủng hoảng về giai cấp lãnh đạo cách mạng Việt Nam. C: Mở ra một bước ngoặt lịch sử của Cách mạng Việt Nam. D: Chấm dứt thời kì khủng hoảng về đường lối của cách mạng Việt Nam.

pt (m^2-1)x-m^2+3m-2=0 có vô số nghiệm khi m bằng ?

BÀI TẬP TRẮC NGHIỆM : giúp e với mn huhu. 1. I apologized to the boy ______ book I borrowed . A. which B. who C. whom D. whose 2. We’d like to buy the house______ overlooks West Lake . A. who B. whose C. where D. which 3. The books _______ written by Jack London is very interesting . A. which were B. were C. whose D. which 4. I am going to visit the town _____ I was born and grew up . A. where B. which C. when D. who 5. This is Mary , ____ is taking over my job when I leave . A. that B. which C. who D. whom 6. An architect is someone _____ designs buildings . A. who B. that C. which D. it 7.I’ll never forget the place _______I first met you . A. at where B. where C. at which D. on which 8. They asked me a lot of questions , _____ I couldn’t answer . A. most of which B. of which most C. most of that D. of that most 9. That is the house in ______I used to live . A. that B. which C. where D. there 10. The man _______ is my teacher . A. who she is speaking to B. whom she is speaking with C. to whom she is speaking D. to whom she is speaking with 11. Sunday is the day _______which we usually go fishing . A. during B. at C. in D. on 12. The music ______ we listened last night was boring . A. to which B. which to C. to that D. that 13. The man ______ I introduced you to last night is thoughtful . A. whom B. that C. Ø D. all are correct 14. She couldn’t answer any question , _______made me surprised. A. that B. it C. this D. which 15. The man is my teacher . I am grateful to him . A. The man whom I grateful to him is my teacher . C. The man is my teacher who I am grateful . B. The man whom I am grateful to is my teacher D. The man to him I am grateful is my teacher . 16. Ngoc is friendly . We are talking about her . A. Ngoc, we are talking about , is friendly . C. Ngoc , about her we are talking , is friendly . B. Ngoc, whom we are talking about is friendly D. Ngoc , about whom we are talking, is friendly 17. A pilot is a person who flies an aircraft . A. A person who called a pilot flies an aircraft . C. A person that flies an aircraft is called a pilot . B. A pilot is someone who flies an aircraft . D. Both B and C are correct . 18. The problems ______they are discussing at the meeting are very important. A. who B. which C. Ø D. both B and C 19. Michael told me about students _______have just got the scholarship . A. which B. Ø C. who D. whose 20. The ring ______ is made of gold and diamond. A. she is wearing it B . he gave it to her C. Linda like D. she is wearing 21. The house ______ is situated in the city centre . A. which B. we have just bought C. in where we live D. which we live 22. That is the student . I borrowed his book last week . A. That is the student I borrowed whose book last week. C. That is the student , whose book I borrowed last week B. The student whose book I borrowed that is . D. That is the student whose book I borrowed last week 23. We like the computer . We bought it yesterday. A. We like the computer which we bought it yesterday C. We like the computer we bought yesterday. B. We like the computer we bought which yesterday D. The computer we like we bought yesterday . 24. It was The World Cup 2002 _______in Korea and Japan . A. which was held B. that were held C. that was held D. that held 25. It / be / these / book / I buy / London . A. It is these books that I buy in London C. It was these books that I bought in London B. It was these books which I bought on London D. It was these books I bought in London .

tam giác có độ dài 3 cạnh như sau có phải là tam giác vuông ko ? vì sao? a/ 9cm ,12cm, 15cm b/1cm, căn bậc 2 của 8 , 3cm c/ 2cm ,4cm,5cm

nêu cảm nghĩ của em về bài thơ tức cảnh pác bó của hồ chí minh theo cách diễn dịch( 10 câu)