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共找到 1627202 与43sinθ交于A 相关的结果,耗时1933 ms
1.已知数列A(n+1)=3An-2A(n-1),A1=1,A2=3,求通项An.2.已知数列{An}的前n项和Sn=3n^2+2n+k,求An.3.数列A(n+1)=An+2^n,A1=2,求An.好的话会追加额~
数学
设a,b属于R,i是虚数单位,若a/(1-i)+b/(1-2i)=5i/(3+i),则a+b=?怎算?
数学
已知a,b属于R,i为虚数单位若(a/1-i)+(b/1-2i)=(5i/3+i)求a+b的值
数学
已知复数z1满足(2+i)z1=3-i,z2=a+1+(a-2)i且|z1-{z2}|
数学
下面一道有趣的数列大题,大家有空看下吧:数列{an}恒满足等式a(n+1)=1/2an+√3/2×√(1-a²n),其中a1∈(1/2,1)数列{bn}恒满足等式bn=an/(2^n)求证:1.a(n+2)=an2.设数列{bn}的前n项和为Tn,则T
数学
Tn,则Tn<√7 /3
现在完成时的题目1.翻译短语与某人争执2.-I'veneverbeentoanaquarium.-NeitherhaveI.(改为同义句)-I'veneverbeentoanaquarium.-I,.3.I'dliketoaDisneyCruise.A.goonB.go
英语
'd like to ___
1.I watching TV when he came in.2.My mother is cooking when I got home.3.I read a story book this time last night.4.What did you do at
英语
5:00 p.m.yeste
(1)已知等差数列{an}与等差数列{bn}的前n项和分别是Sn,Tn,若Sn/Tn=2n+1/3n-2,则a9/b9=(2)等差数列{an}为递减数列,且a2a3a4=48,a1+a3+a5=12,则数列{an}的通项公式为(3)已知数列{an}满足a1=1,an=
数学
3^(3n-1)+a(n-1
在数列{an}中,a1=1,a2=1,a(n+1)=kan+a(n-1).1,若k=-3/2,bn=a(n+1)-dan,数列{bn}是公比为c的等比数列,求c和d的值.
数学
把下列句子改成否定句.1.All the boys went swimming in the lake .2.Jim watches cartoons in the evening.3.I was a doctor last year.4.There were som
英语
birds in the
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