计算98+998+9998+``````+9999

计算98+998+9998+``````+999999``````(50个9）8=

1个回答

98+998+9998+``````+999999``````(50个9）8
=100-2+1000-2+10000-2+.+1000000.00000-2(50个0)
=1111.111100(48个1)－2*50
=111.111000(47个1)