9.如图7-76所示,在菱形ABCD中,∠ B =60° ,点 M在AB上,点 N在BC上,AM =BN,CM交AN于点P ,DP交AC于点Q.求证:(1) △ABN
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It is very important to her.Harry’s ambition changes every day! One day he wants to be an astronaut. The next day he wants to be a pop singer. 80 His mother would be happy if his ambition was to get up in time for school every day! What’s your ambition?A...
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Telegram Team EQAuz15H1ZHrZ_psVrAra7HealMIVeFq0wguqlmFno1f3EJj Fragment EQBAjaOyi2wGWlk-EDkSabqqnF-MrrwMadnwqrurKpkla9nE Fragment EQCFJEP4WZ_mpdo0_kMEmsTgvrMHG7K_tWY16pQhKHwoOoy2 Fragment EQBeab7D38RIwypegbN7YZgQzwDbb8QfMMwY8ouJc3qPl91M Fragment EQBDUShg1UmAzyTVmGijDmeZJ_sTc8EJZ...
(Ⅱ)设{bn-(-1)nan}是等比数列,且b2=7,b5=71,求数列{bn}的前n项和Tn. 试题答案 在线课程 考点:等差数列与等比数列的综合 专题:等差数列与等比数列 分析:(Ⅰ)设出等差数列的公差,结合a1=2,且a2,a4,a8成等比数列列式求出公差,则数列{an}的通项可求;(Ⅱ)把数列{an}的通项代入bn-(-1)nan,由...
分析 根据单项式与单项式相乘,把他们的系数分别相乘,相同字母的幂分别相加,其余字母连同他的指数不变,作为积的因式,计算即可. 解答 解:(am+1bn)(a2m-1b2n)=a3mb33n=a5b6,m=5353,n=2,m+n=5353+2=113113. 点评 本题考查了单项式与单项式相乘,熟练掌握运算法则是解题的关键.练习...
用硼砂(Na 2 B 4 O 7 )和尿素反应可以得到氮化硼：Na 2 B 4 O 7氯化硼(BN)晶体是一种新型...
运-20并不是模仿伊尔-76。运-20是中国自主研发的新一代军用大型运输机,其设计参考了伊尔-76的气动外形和结构设计,同时也融合了美国C-17的部分特点。运-20的研发旨在提高中国航空工业的水平,满足国防和经济发展的需求。12 运-20与伊尔-76在气动外形和结构上有相...
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