Đáp án:
Giải thích các bước giải:
Xét ΔABC có :
AM = MB = $\frac{AB}{2}$
AN = NC = $\frac{AC}{2}$
=> MN là đường trung bình của ΔABC.
=> MN || BC và MN = $\frac{1}{2}$ BC ( tính chất đường trung bình ) .
giúp mk vs ạ, mk đang cần gấp lém
Các thầy cô giáo, anh chị Giúp em với ạ
Viết một đoạn văn khoảng 8 câu nêu cảm nhận của em về khổ thơ cuối trong bài Tiếng gà trưa của Xuân Quỳnh. Cháu chiến đấu hôm nay Vì lòng yêu Tổ quốc Vì xóm làng thân thuộc Bà ơi, cũng vì bà Vì tiếng gà cục tác Ổ trứng hồng tuổi thơ
CÂU 1: Thế nào là câu rút gọn? Xác định câu rút gọn và cho biết chúng bị rút gọn thành phần nào? (VD: "Sáng mai đi chơi nhé!" => Rút gọn thành phần chủ ngữ của câu. => Khôi phục: Sáng mai mình đi chơi nhé (không cần khôi phục, cô chỉ VD thôi nhé!) a) - Bạn ăn sáng chưa? -Ăn rồi. b) -Những quyển sách này của ai? - Tôi. c) Khi nào bạn đi Hà Nội? - Tuần sau. Cho em cin kết quả bài làm
a) 3(x + 7 ) +9 = 9 - 2 ( x + 5 ) b) 218 - ( x + 31 = x - 29
tính bằng 2 cách :(-15+30).(-6) mik cần giải gấp
Các bạn giúp mình nhé mình đang cần gấp lắm bạn nào làm đúng nhất mình sẽ cho bạn 5 sao
1.trang ____ me 20 minutes ago. A. phones B. phoned C. had phoned D. has phoning * 2.Her mother ..................this city two years ago. A. left B. leaves C. is leaving D. will leave * : …………..is it from your house to school? – About two kilometers A. How far B. How long C. How high D. How * friend and I …………… you too long A.has been waited B. has waited C. have waited D. have been waiting * .He has been selling motorbikes ________. A. ten years ago B. since ten years C. for ten years ago D. for ten years * While we_______ in the park, Mary fell over. A. ran B. are running C. was running D. were running * It was ………………….. warm when we were in Vienna. A. very B. so C. such D.too * My sister ___________ how to swim. A.Don’t know B. doesn’t know C.don’t knows D. not know * She is ……………….. old to work. A. very B. too C. so D.such * I ______ (have) dinner when I suddenly heard a loud bang. A. was having B. were having C. had D. having * He is a ………………….. intelligent child. A. very B. so C. too D.much * . _________ flown in an aeroplane before? A. Have you ever B. Had you ever C. Are you D. Do you * It was …………………. hot that we didn’t go out. A. such B. so C. very D.tooA * The sun . . . . . . . . . . . . . . . in the east. A. rise B rose C. rises D rising * . I (be)___ a student in Moloxop School in 1998. A. was B. were C. to be D. to was * Jack _________ his homework yet, so he won’t go out with his friends A. finish B. has finished C. doesn’t finish D. hasn’t finished * I___ (not / understand) what they were talking about. A. did not understand B. not understand C. do not understand D. does not understand * Son Tung MTP is my favourite singer. He __________ very well. A. draws B. sings C. takes D. makes * The Smiths never___________to their neighbors A. Talk B. talks C. don’t talk D. doesn’t talk * When I phoned my friends, they (play) ________ cards. A. played B. were played C. were playing D. was played * Christopher Columbus _______ American more than 500 years ago. A. discovered B. has discovered C. had discovered D. had been discovering * My classmates ___________lazy. They always do their homework. A. Are B. is C. aren’t D. isn’t * I ______ to New York three times this year. A. have been B. was C. were D. had been * The tea was …………………. hot .A. so B. very C. such D.much * Now, my classmates __________ new books and clothes for children in flooded areas in some central provinces. A. donate B. donates C. are donating D. donated * _______your keys yesterday? A. Did you find B. Were you finding C. was you finding D. Were you find * I _________ a bath when the phone rang A. was having B. had C. am having D. have * .We _______ Dorothy since last Saturday. A. don’t see B. haven’t seen C. didn’t see D. hadn’t seen * I __________ French when I was a child. A. studies B. study C. studied D. were study * It’s ………………… terrible weather. A. such B. so C. much D.too * . Would you be ………………….. kind as to tell me the time?A. so B. very C. too D.such * . She is looking ………………….. older. A. so B. such C. very D.too * While Tom (play)___ the piano, his mother was doing the washing-up. A. was playing B. were playing C. played D. play * Because Lan _________ breakfast, she isn’t hungry now A. was eating B. eats C. ate D. has eaten * They _________ maried for 22 years A. have got B. have been C. was D. got * The milk was …………………. good that we couldn’t stop drinking it. A. very B. too C. so D.such * . He spoke ………………… fast that nobody could understand. A. so B. very C. too D.such * They_______ football on TV at 7 p.m. yesterday. A. were watching B,watched C.was watching D.watched * We have lived in this town _________ 1998 A. for B. since C. ago D. in * Right now I am attending class. Yesterday at this time I ______ class A-attended B-was attending C-was atteded D-were atteded *
Một mảnh đất hình chữ nhật có chiều dài 30m , chiều rộng 20m . Người ta đào 1 cái có bán kính 15m . Tính diện tích còn lại ? Mik thấy đề hơi sai , ai thấy vậy thì sửa đề và giải hộ mik ạ !
giúp e với ạ em cần gấp mai phải nộp r ạ
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