Trong mặt phẳng tọa độ Oxy cho tam giác ABC với A(-1;1) , B(1;3) , C(1;-1). Tìm tọa độ trọng tâm của tam giác ABC. Chứng minh tam giác ABC vuông cân tại A

Các câu hỏi liên quan

D.WRITING I. Make sentences from the words/ phrases given. 1. We/ keep/ our bodies/ warm/ avoid/ flu/ a cold. .............................................................................................................. 2. You/ not/ play/ more/ computer games/ free time. .............................................................................................................. 3. Vitamins/ play/ important/ role/ our diet. .............................................................................................................. 4. Getting/ enough/ rest/ help/ you/ concentrate/ school. .............................................................................................................. 5. Doctor/ asking/ Huy / questions/ about/ health problems. .............................................................................................................. 6.That dog/ not/ as dangerous/ it looks. .............................................................................................................. 7.Schools in Viet Nam / different/ schools/ the USA. II. Reorder the words to make sentences. 1.children/ cookies/ milk. / and/ like/ most .............................................................................................................. 2.like/ I/ don’t/ coffee/ I/ like tea./ , but .............................................................................................................. 3. Ha Noi/ homeless/ give/ in/ clothes/ away/ they/ warm/ to/ people. .............................................................................................................. 4.vacation/ since/ we/ haven’t/ last/ had/ a/ year. .............................................................................................................. 5.printer/ under/ this/ guarantee/ is. .............................................................................................................. 6.our/ a/ in/ makes/ volunteering/ difference/ community. .............................................................................................................. 7.you/ have/ finished/ homework/ your/ yet? .............................................................................................................. 8.get/ it’s/ easy/ flu/ to/. .............................................................................................................. III. Write a paragraph about : 1.Write a paragraph about your hobby, depending on the suggestions below - Name of the hobby. - When you started it. - Who do you share it with. - How you do this hobby. - Feelings about the hobby. My hobby is …………………………………………………………………………. 2.Write a short paragraph about your neighborhood, using the cues below - Where is your neighborhood? - What are there in your neighborhood? - Do you like living there? What do you like about it? - What do you dislike about it? So do you think what people in your neighborhood should/ shouldn’t do to improve this? ..........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................