问题标题:
【一道数学题,用等比数列的求和知识:Afrogjumps0.5m.Itthenjumps0.1mandoneachsubsequentjumptravels0.2mofthepreviousdistance.Findthetotaldistancethroughwhichthefrogjumps.一只青蛙跳了0.5米,然后跳了0.1米,】
问题描述:
一道数学题,用等比数列的求和知识:
Afrogjumps0.5m.Itthenjumps0.1mandoneachsubsequentjumptravels0.2mofthepreviousdistance.Findthetotaldistancethroughwhichthefrogjumps.
一只青蛙跳了0.5米,然后跳了0.1米,接下来每次跳的距离是之前距离的0.2倍,求青蛙总共跳的距离
巴宏欣回答:
等比数列求和公式:Sn=a1(1-q^n)/(1-q),a1=0.5,q=0.2.
这道题是求当n->无穷的时候Sn趋近的值,将数据带入Sn=0.5(1-0.2^n)/(1-0.2),当n->正无穷时,0.2^n->0,所以就是0.5*1/(1-0.2)=5/8米.
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