11...1(1000个1)减22.2(500个2)等于多少?
问题描述:
11...1(1000个1)减22.2(500个2)等于多少?
答
11...1(1000个1)减22.2(500个2)
=11.1(500个)00.0(500个)+11...1(500个)-22...2(500个)
=11...1(499个)+100...0(500个0)-11...1(500个)
=11..1(499个)088...(499个8)9