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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 这题为什么选c, 第8题为何选C? 第12题为什么选C 六下应用题把若干盆黄菊花和白菊花摆成前后两排,至少摆多少列才能保证有两列的摆法相同 ①制造一批零件师傅需要6时 师徒工作效率比是4：3 求徒弟用时（方程）②一辆客车2时行110km 从甲地到乙地有330km 到达乙地需要几时 如果提速20％ 可以少用多少小时（方程） 6年级应用题啊甲乙两地相距240千米,汽车从甲地开往乙地速度为36千米/时,摩托车从乙地开往甲地速度为24千米/时,摩托车从乙地开出2.5小时后,汽车也由甲地开出,问汽车开出后几小时遇到摩托 初一上册英语周报第七期答案 因式分解 必采纳啊因式分解. 简单因式分解.必采纳.