H.thang ABCD (AB // CD) , E là trung điểm BC ; `\hat{AED = 90^0} . C/m DE là phân giác `\hat{D)` LƯU Ý : Chỉ cần hình

Giup em với à nha ! Bài tập : Cho tam giác ABC cân tại A. Trên cạnh BC lần lượt lấy hai điểm M, N sao cho BM = CN. a) Chứng minh rằng là tam giác cân . b) Kẻ BH AM ( H AM ), kẻ CK AN ( K AN ). Chứng minh rằng BH = CK, AH = AK. c) Gọi O là giao điểm của BH và CK. Tam giác OBC là tam giác gì ? Vì sao ? d) Khi và BM = MN = CN, hãy tính số đo các góc của tam giác ABC.

giúp mình với, mình đang cần gấp

166. Many scientists are eager to look _______ life on other planets. A. after B. at C. for D. up 167. We missed the first bus to the station but _______ we got there just in time for the last train. A. luckily B. unlucky C. lucky D. Unluckily 168. If he ……me, I will be ready to help him. A. ask B. will ask C. asks D. to ask 169. Paola needs ............her writing skill or she will fail in the coming written examination. A. to improve B. improve C. improving D. to be improved 170. .............you want to keep fit, you should do more exercises. A. Although B. If C. When D. Whether 171. They enjoy..............to music in the evening. A. being listened B. listened C. listening D. listen 172. A daily newspaper was published in Germany in 1550, ……….? A. isn’t it B. is it C. was it D. wasn’t it 173. “Can I try your new camera?” – “__________” A. I’m sorry, I can’t. Let’s go now B. I’m sorry. I’m home late C. Sure. I’d love to. Sure D. But please be careful with it. 174. In the summer my brother always wears shirts with short…… A. hands B. arms C. sleeves D. shoulders 175. This new blouse is lovely, and very……. A. fashion B. style C. lifestyle D. fashionable 176. Lunar New Year is the festival ………..popular in China, too. A. which was B. which are C. which is D. in which 177. ”Goodbye . have a nice weekend”. – “ Goodbye , …………….” A. Me,too B. You are welcome C. not at all D. the same to you 178. Last night we came to the show late ............................. the traffic was very bad. A. despite B. so C. although D. because 179. would you give me the reasons for……………the Mother's Day? A. celebrated B. celebrating C. celebration D. celebrate 180. We had an ______ trip to the country last weekend A. excited B. exciting C. excite D. to excite

tinh nhanh 5 ×0,2+4 ×0,25 tim x x ×125+11=989

151. The match takes place _________ Saturday afternoon this week. A. of B. on C. after D. to 152. She is the girl _________ eyes are beautiful. A. her B. whom C. whose D. those 153. If I were rich, I ______ around the world. A. travel B.will travel C. would travel D. traveled 154. The entrance examination ______ on June 22nd 2012. A. to held B. held C. hold D. will be held 155. I'm very ______ to you for putting in so much hard work. A. thoughtful B. grateful C. considerate D. careful 156. “I’m taking my entrance exam next month.” - “______” A. Congratulations. B. Well done. C. Yes, please. D. Good luck. 157. He speaks English very ____________ . A. fluent B. fluency C. fluence D. fluently 158. Lan seldom goes to the movies , ____________ she? A. doesn’t B. does C. did D. didn’t 159. Because plastic bags are very hard to _________they will cause pollution A. dissolve B.wrap C. tear D. collect 160. The bedroom has just been ________ the children A. decoration B. decorator C. decorated D. decorates 161. You will not succeed _______ you work hard. A. unless B. without C. if D. although 162. The man ______ daughter has just won the first prize in the English speaking contest is a famous environmentalist. A. whose B. which C. who D. that 163. Tom is very intelligent. ______, he’s lazy. A. So B. But C. Therefore D. However 164. He asked me if I_________to school by bicycle every day. A. am going B. go C. was going D. went 165. I can’t understand the French visitors. I wish I________French. A. knew B. will know C. know D. have known

cách sử dụng điện? cách tiết kiệm điện? cách tránh bị điện giật? cách cứu người bị điện giật?

cho A=x-5/x-3 tìm số nguyên x để A nhỏ nhất .tìm giá trị nhỏ nhất đó GIÚP tui với mn ơi!!!!

Tìm x `(1/4 - x)^2 - 125% = 1 13/16`

1/căn bậc 1 + 1/căn bậc 2 + 1/căn bậc 3 + ..... + 1/căn bậc 100 >10