user-avatar
hocngunhubo
2 năm trước
cho hình tam giác ABC có AB = 20 cm,AC =25 cm.Trên cạnh AB lấy điểm D cách A là 15 cm;trên cạnh AC lấy điểm E cách A là 20 cm.Nối D với E được hình tam giác ADE có diện tích là 45 cm2 . Tính diện tích tam giác ABC
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

1.Drugs helped to ………………………………………the pain in my chest A. catch B. relieve C. protect D. continue 2. Good health is one of………………………………..in a preson’s life A. best thing B. the best things C.the best thing D. best things 3. Group play helps children develop …………………………….skill A. careful B. regular C. useless D. social 4. I’m busy tonight. I have ……………………………….homework to do A.many B. a lot of C. little D. a few 5.Which is…………………...of these two books ? A. cheaper B.cheap C. cheapest D. the cheapest 6. Every student ………………….listening to music A. like B. to like C. liked D. likes 7.The news on TV last night .................very good A..was B.has C.were D.be 8.Lan didnt know the world. Hoa didnt ............... A.so B.neither C.either D.too 9.He is reading comics with great ……………… A. please B. pleasant C. pleasure D .pleased. 10.Television is one of the best means of ......................... A.transportation B.production C.transport D. communication 11.My mother with her friends ………………………jogging everymorning A. go B. goes C. will go D. went 12.Eating sensibly will …………..us from illness A. do B. help C. laugh D. protect 13.The parents often wait ………….their children have toothache before they see a dentist A. for B. until C. to D. in 14. When I saw the dentist, he looked at my teeth to check that they are……..in the right way A. grow B. growing C. to grow D.grows 15. What should we do about training good students I think ...should be more good teacher at school A. should B. we C. there D. ought II.Give the correct form of the verbs in brackets (10ps) 1. Nam always (talk) .............a lot when the teacher is explaining 2.Did you have any difficulty (make ) .................friend? 3." Your face is dirty, Tom " - " All right, I (wash) .......it " 4.Sorry I cant meet you because I (cook)……………………………. 5. It is important for him ( see) ………………….the doctor twice a year 6. Duy ( not visit)… ………the museum with his class last sunday because he (catch ) ……. a cold. 7. How much it ( cost ) …………….to mail a latter to England ? 8. Take these pills and you ( feel ) ……………….. better then, Ha . 9.I am preparing some candies because I (have) ………….a big party tonight. 10.None of his brothers (be) ………………..at home.they are out III. Fill in each blank with the correct form of the word(10ps) 1. ………must be carefull CYCLE 2. There are fouty ……. for this job INTERVIEW 3. Miss lan is a good ……………. TEACH 4. Children should eat in ………..amounts of every things MODERATION 5. Is your new school………..from your old one. DIFFER 6.My brother doesn’t go to school because of his………. DEAF 7.Next Sunday,there will be a walking competition held to raise funds for the.............(ABLE ) 8.There is a ................... movie on TV tonight. (DETECT) 9.We are all ………..about going on an excursion to Cuc Phuong forest next weekend. EXCITE. 10.There are about 200 ………….in this company. EMPLOY IV. Fill in each blank a correct preposition (10ps) 1. Mr. Minh is not at home now. He is …………work. 2.These cards are in alphabetical order and …………author. 3.Dr Phong fills the cavity ..............Van's stooth 4.I’m reading a book …................ history of China. 5.My aunt sliced the beef ...............................thin strips. 6.Do you give each other presents ..................Christmas Day. 7.Teenagers are concerned _________ the enviroment. 8.These cards are in alphabetical order and …………author. 9. Please look _________ my children while I’m working. 10.It's easy to find a book ............the title 10.You can't stay fit ...............any physical exercise.

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team