问题描述: 999…9(1988个9)*999…9(1988个9)+1999…9(1988个9)=? 1个回答 分类:数学 2014-11-09 问题解答: 我来补答 =[1000...000(1988个0)-1]*[1000...000(1988个0)-1]+[2000...000(1988个0)-1]=1000...000(3976个0)-2*[1000...000(1988个0)-1]+1+2*[1000...000(1988个0)]-1=1000...000(3976个0) 展开全文阅读