1/ cau tao cay reu don gian nhu the nao? 2/ so sanh dac diem cau tao cua reu va tao ? 3/ tai sao reu song tren can nhung chi o noi am uot? 4/ so sanh voi cay co hoa , reu co gi khac? 1/ cay duong xi gom nhung bo phan nao? 2/ cay duong xi sinh san bang bo phan nao? neu qua trinh sinh san cua duong xi? 3/ than da duoc hinh thanh nhu the nao? 1/ co quan sinh san cua thong la gi? cau tao ra sao? so sanh dac diem cau tao va sinh san cua cay thong va cay duong xi?

tìm 2 số tự nhiên a và b biết BCNN(a,b)=420 ; UCLN(a,b)=21 và a+21=b giải thik chi tiết từng bước giải xong mik vote 5 sao cảm ơn nhiều ạ giúp mik với

Giả sử p=abc ( số có 3 chữ số ) là snt . Cm pt ax^2+bx+c=0 không có nghiệm hữu tỉ

so sánh các kiểu sinh trưởng và phát triển ở động vật , phần giống nhau

có 8 phòng học ,mỗi phòng học có 15 bộ bàn ghế ,mỗi bộ bàn ghế ,mỗi bộ có 2 học sinh đang ngồi học .hỏi có tất cả bao nhiêu học sinh đang ngồi học ?

mô tả về đặc điểm của thấu kính hội tụ vẽ đg truyền của tia sáng đặc biệt

Exercise 4. Mark the letter A, B, C or D to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions. 57. The A.I. expert wanted to have his assistant ____ the newly made robot. A. activate B. activated C. activating D. to activate 58. Kelly wanted a live band ____ at her wedding. A. been playing B. to play C. played D. to be played 59. I spoke to Victor last night and he said he ____ while he was on holiday. A. got stolen his phone B. had his phone stolen C. had stolen his phone D. was got his phone stolen 60. Why don't you ____ when you install this new electric gadget? A. get Aaron help B. have Aaron help C. have Aaron helped D. have got Aaron help 61. As soon as Dad ____, we can leave. A. got the car to start B. has got the car started C. got started the car D. was got starting the car 62. My teeth were little yellow, so I ____ by the dentist. A. had cleaned them B. had them cleaned C. have them cleaned D. was cleaned them 63. Can we ____ this summer? A. get installed air-conditioning B. get air-conditioning to install C. have air-conditioning installed D. have installed air-conditioning 64. The car manufacturer ____ two automatic systems this morning. A. has had a robotics company install B. had a robotic company installed C. had a robotic company install D. got a robotic company installed 65. The computer corporation ____ malfunctioning products. A. had their workers eliminate B. had their workers to eliminate C. had their workers eliminating D. had their workers eliminated 66. The robot manufacturer ____ their outdated robots for the next generation robots. A. asked his customers exchange B. got his customers exchanged C. had his customers exchanged D. had his customers exchange 67. Samsung ____ by those who have bought them for technical faults. A. has all Galaxy Note 7 returned B. has all Galaxy Note 7 to returned C. made all Galaxy Note 7 return D. made all Galaxy Note 7 returned 68. Experts believe that in the near future humans ____. A. have robots do the housework B. have had the housework done by robots C. will do the housework by robots D. will have robots do the housework 69. Nowadays, for the sake of human life, the military ____ which contain explosives. A. have A.I. robots explore dangerous environments B. get A.I. robots explore dangerous environments C. have A.I. robots explored dangerous environments D. get A.I. robots explores dangerous environments 70. Thanks to the A. I applications, Internet users ____ into a new language in real time. A. can translate webpages B. can have webpages translate C. can have webpages translated D. can get webpages to translate

Giúp với ạ.....,. Mình đag cần gấp 😭😭😭

nguyên hàm (cos^2x/sin3x + pi/2).ln6xdx

Cho 5,6 gam canxi oxit (CaO) tác dụng với dung dịch chứa 7,3 gam axit clohiđric (HCl), tạo thành muối canxi clorua (CaCl 2 ) và 1,8 gam nước(H 2 O) a. Lập phương trình hóa học. b. Viết biểu thức về khối lượng của phản ứng xảy ra. c .Tính khối lượng canxi clorua tạo thành.