作业帮设数列An,Bn 满足a1=b1=6,a2=b2=4,a3=b3=3
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设数列An,Bn 满足a1=b1=6,a2=b2=4,a3=b3=3
设数列An,Bn 满足a1=b1=6,a2=b2=4,a3=b3=3,若{an+1 -an}是等差数列,{bn+1-bn}是等比数列.
1.求An Bn 通项
2.求数列AN最小项及最小值
3.是否存在K属于N*,使ak-bk属于（0.0.5）若存在,求所有的K
设数列An,Bn 满足a1=b1=6,a2=b2=4,a3=b3=3,若{an+1 -an}是等差数列,{bn+1-bn}是等比数列.
1.求An Bn 通项
2.求数列AN最小项及最小值
3.是否存在K属于N*,使ak-bk属于（0.0.5）若存在,求所有的K
我告诉你方法吧!通过a3-a2-(a2-a1)求出d=1然后再根据an+1-an=a2-a1+(n-1)d,求出an+1-an ,再将an+1-an,an-an-1…a2-a1进行叠加,即可求到an,同理求bn,有通式,剩下的就自己算吧
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