lg(2)=0.301029995663981195213738894724493026768189881462108541...
lg(2^100)= 100 log(2) =30.1029995663981195213738894724493026768189881462108541...
所以2^100是个31位数,开始有效数字是
10^0.10299956639811952137388947244930=1.2676506002282294014967032053760
其实:
2^100=1267650600228229401496703205376
2^100=10^x
两边取对数,求x
答案是x+1
2的10次方=1024,
2的100次方是十个1024相乘