已知{an}满足a1=1,a(n+1)=2an+2,求an
来源:学生作业帮助网 编辑:作业帮 时间:2024/04/30 12:33:26
已知{an}满足a1=1,a(n+1)=2an+2,求an
已知{an}满足a1=1,a(n+1)=2an+2,求an
已知{an}满足a1=1,a(n+1)=2an+2,求an
两边同加上2得
a(n+1)+2=2(an+2)
即[a(n+1)+2]/(an+2)=2
a1+2=3
∴数列{an+2}是以3为首项,2为公比的等比数列
an+2=(a1+2)q^(n-2)=3×2^(n-1)
∴an=3×2^(n-1)-2
不懂,请追问,祝愉快O(∩_∩)O~
知a(n+1)+2=2an+4
即(a(n+1)+2)/(an+2)=2
则an+2成等比 an+2=3*2^(n-1)
则an=3*2^(n-1)-2
已知数列{an}满足a(n+1)=an+n,a1=1,则an=
已知{an}满足a1=1,a(n+1)=2an+2,求an
已知数列{an}满足a(n+1)=an+lg2,a1=1,求an
已知数列an满足:a1=1,an-a(n-1)=n n大于等于2 求an
已知数列{an}满足a1=33,a(n+1)-an=2n,则an/n的最小值
已知数列{an}满足a1=33,a(n+1)-an=2n,求an/n的最小值
已知数列an满足a1=100,a(n+1)-an=2n,则(an)/n的最小值为
已知数列an满足a1=2,an=a(n-1)+2n,(n≥2),求an
已知数列{an}满足a1=1,3a(n+1)+an-7
已知数列{an}满足a1=2,a(n+1)-an=a(n+1)*an,则a31=?
已知数列{a}满足a1=1/2,a(n+1)=an+1/(n^2+n),求an已知数列{a}满足a1=1/2,a(n+1)=an+1/(n^2+n),求an
已知数列{an}中满足a1=1,a(n+1)=2an+1 (n∈N*),证明a1/a2+a2/a3+…+an/a(n+1)
已知数列满足a1=1,an-a(n-1)=n-1,求其通项
已知数列{an}满足a1=1,a(n+1)=nan n+1是角标
已知{an}满足a(n+1)=2的n次方*an且a1=1求an
已知数列{an}满足a(n+1)=an+3n+2,且a1=2,求an=?
已知数列{an}满足a1=5,a(n+1)=an+6n+6,则an=
已知等差数列{an}满足a(n+1)=an+3n+2,且a1=2,求an.雪地跪拜!