（1）當(dāng)它第四次著地時(shí)總路程=100+50+50+25+25+12.5+12.5+6.25=281.25米
（2） 總路程為 100+50+25+12.5···························100/2^(n-1)
50+25+12.5+6.5·····························50/2^(n-1)
兩個(gè)等比數(shù)列之和 當(dāng)n趨于無(wú)窮大時(shí)上邊的數(shù)列和比下邊的數(shù)列和多100
對(duì)于下邊的數(shù)列
Sn=A1(1-q^n)/(1-q) =50(1-(1/2)^n)/(1-1/2)
當(dāng)n趨于無(wú)窮大時(shí)Sn=50/(1/2)=100
當(dāng)n趨于無(wú)窮大時(shí)總路程 2Sn+100=300
所以：它到落地靜止時(shí)所經(jīng)過的路程不超過300米