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如果三角形的三条边长分别是4CM,5CM,6CM,以这个三角形各顶点为圆心的三个圆两两外切.求各圆的半径 在极限中,x趋向于0正或x趋向于0负是到底是什么意思 3.新华汽车厂计划生产汽车4800辆,实际比计划增产15％,实际比计划增产多少辆? 已知圆O经过△ABC的三个顶点,且AB=AC,圆心O到BC的距离为3,圆半径为7,球AB的长 已知三角形ABC中,AB=AC,点A,B,C在以O为圆心的同一个圆上,圆心O到BC的距离为3CM,圆的半径为7CM,求腰长AB. 某生产厂家经过两年的时间,将产量提高百分之四十,则平均每年增产的百分率为?列式子 12.056读作（?）,它的计数单位是（?） 时间一定,总产量和日产量成什么比例? 农场计划用2年时间把产量提高69%,如果每年比上一年提高的百分数相同,求这个百分数 要式子!急 已知数列{an}为等差数列,公差为d,{bn}为等比数列,公比为q,且d=q=2,b3+1=a10=5.设Cn=anbn1、求数列{Cn}的通项公式,2、数列{Cn}的前n项和Sn.和lim(n趋向于正无穷大)nbn/Sn的值!… 已知等差数列{an}的公差为d（d不等于0）,等比数列{bn}的公比为q（q>1）.设sn=a1b1+a2b2…+anbn,Tn=a1b1-a2b2+…+（-1）^(n-1)*anbn,n属于正整数.1）若a1=b1=1,d=2,q=3,求s3的值,若b1=1,证明（1-q）*S2n-（1+q）T2n=2dq 已知数列{an}的前n项和为Sn,且对任意正整数n都有an是n与Sn的等差中项（1）求证：an=2a（n-1）+1（n≥2）（2）求证：数列{a（n+1）}为等比数列（3）求数列{an}的前n项和Sn 高一英语题.（请分别解释正确选项与错误选项）谢谢!1.I can’t understand it. Will you please ____once more?A.explain that word B.repeat that wordC.explain us that word D.explain that word for us答案：A2.What he said is ____s I want to know if I smoke here.— No,youI want to know if I smoke here.— No,you .Could you see the sign “NO SMOKING” there?A．can; needn’tB．must; can’tC．shall; won’tD．may; mustn’t -I want to know if I_______smoke here.-no,you____.could you see the sign“NO SMOKING” there?Acan,needn't Bmust,can't Cshall,won't Dmay,mustn't 碳的两种氧化物的化学式及碳的化合价分别是? Does your father smoke?(I want to know...)变宾语从句 You are able to smoke here if you want to. 三角形ABC中,AD=BC,AD垂直BC,BE垂直AC,G为BC中点.求证：三角形BDF相似于三角形ADC.DF+GF=1/2乘BC.相似我已证，请告诉我DF+GF=1/2乘BC怎么证. Why to want to like?this is not what i want .翻译成中文 I don't like you ,Why to want to marry you?中文I don't like you ,Why to want to marry you? I love cigars,I want to smoke cigars,strong中文是什么意思求大神帮我翻译一哈! 求一首中文歌,其中有句歌词是tell me why i don t want to say goodbye一男生唱的 曲调很轻快的 用数学归纳法证明：n>=3,0用数学归纳法证明：n>=3,0 用数学归纳法求证：|sin（nx）|≤ n|sinx|（n∈N*）打得好有分 给50分1.（1）某商店运来红毛衣25包,蓝毛衣10包.蓝毛衣的包数是红毛衣的几分之几?（2）某商店运来红毛衣25包,运来蓝毛衣的包数是红毛衣包数的五分之二.商店运来蓝毛衣多少包（3）某商店 1.同义句转换：(1)I have a big family.____ ____ people in my family.(2)My mother doesn't have a job.My mother is ____ ____ work.(3)My mother is Kay.Kay is my ____ ____.(4)Do you do me a favor?Do you ____ me a ____?____ you ____ me?(5)Why don't y 2000加2000乘2乘1999加1999的平分乘2000.因式分解 多少岁是婴儿、儿童、青少年、少年、成年人? My home is __ the school.A.two miles away B.two miles away from C.two miles D.two miles from对的对在哪．错的错在哪．翻译 her home is about ____ his school 1.10 miles far away 2.10 miles away 3.10 miles away from4.10 miles far 问一道数学题,50分!王师傅和张师傅共同加工一种零件.王师傅加工了8小时,张师傅加工了6小时,一共加工了58个零件.如果王师傅平均每小时比张师傅多加工2个零件,王师傅和张师傅平均每小时