关于数学数列习题提问1 设an是等差数列,bn是各项都为正数的等比数列且a1=b1=1,a3+a5=21,a5+b3=1
来源:学生作业帮 编辑:搜狗做题网作业帮 分类:数学作业 时间:2024/07/22 10:02:50
关于数学数列习题提问
1 设an是等差数列,bn是各项都为正数的等比数列且a1=b1=1,a3+a5=21,a5+b3=13 求an与bn的通项公式
2已知数列an为等差数列,公差d不等于0,其中ak1(k1为下标),ak2,````akn恰为等比数列,若k1=1,k2=5,k3=17,求k1+k2+```+kn
1 设an是等差数列,bn是各项都为正数的等比数列且a1=b1=1,a3+a5=21,a5+b3=13 求an与bn的通项公式
2已知数列an为等差数列,公差d不等于0,其中ak1(k1为下标),ak2,````akn恰为等比数列,若k1=1,k2=5,k3=17,求k1+k2+```+kn
![关于数学数列习题提问1 设an是等差数列,bn是各项都为正数的等比数列且a1=b1=1,a3+a5=21,a5+b3=1](/uploads/image/z/4321102-22-2.jpg?t=%E5%85%B3%E4%BA%8E%E6%95%B0%E5%AD%A6%E6%95%B0%E5%88%97%E4%B9%A0%E9%A2%98%E6%8F%90%E9%97%AE1+%E8%AE%BEan%E6%98%AF%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%2Cbn%E6%98%AF%E5%90%84%E9%A1%B9%E9%83%BD%E4%B8%BA%E6%AD%A3%E6%95%B0%E7%9A%84%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%E4%B8%94a1%3Db1%3D1%2Ca3%2Ba5%3D21%2Ca5%2Bb3%3D1)
(1).a3+a5=2a4=21
a4=21/2
d1=(a4-a1)/3=19/6 a1=1
an=1+(n-1)*19/6
b5=13-a4-d1=
q2=4根号b5
bn=(1-q2的n次方)/(1-q2)
具体算自己算下吧
a4=21/2
d1=(a4-a1)/3=19/6 a1=1
an=1+(n-1)*19/6
b5=13-a4-d1=
q2=4根号b5
bn=(1-q2的n次方)/(1-q2)
具体算自己算下吧
关于数学数列习题提问1 设an是等差数列,bn是各项都为正数的等比数列且a1=b1=1,a3+a5=21,a5+b3=1
设数列{an}是等差数列,{bn}为各项都为正数的等比数列.且a1=b1=1,a3+b5=21,a5+b3=13.
设{an}是等差数列,{bn}是各项都为正数的等比数列且a1=b1=1,a3+b5=21,a5+b3=13.求{an},
设{an}是等差数列,{bn}是各项都为正数的等比数列且a1=b1=1,a3+b5=21,a5+b3=13.求[an},
设{an}是等差数列,{bn}是各项都为正数的等比数列,且a1=b1=1,a3+b5=21,a5+b3=13,求{an}
1.{an}是等差数列,{bn}是各项都为正数的等比数列,且a1=b1=1,a3+a5=21,a5+b3=13,求{an
设{an}是等差数列,{bn}是各项都为正数的等比数列,且a1=b1=1,a3+b5=21,a5+b3=13 (1)求{
设{an}是等差数列,{bn}是各项都为正数的等比数列且a1=b1=1,a3+b5=21,a5+b3=13.
设an是等差数列,bn是各项都为正数的等比数列,且a1=b1=1,a5+b3=13 a3+b5=21
设{an}是等差数列,{bn}是各项都为正数的等比数列,且a1=b1=1,a3+b5=21,a5+b3=13
设{an}是等差数列,{bn}是各项都为正数的等比数列且a1=b1=1,a3+b5=21,a5+b3=13
设{an}是等差数列,{bn}是各项都为正数的等比数列,且a1=b1=1,a3+b5=21,a5+b3=13.