数学题9+99+999+9999+······+9999·9999(2000个9)
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数学题9+99+999+9999+······+9999·9999(2000个9)
数学题9+99+999+9999+······+9999·9999(2000个9)
数学题9+99+999+9999+······+9999·9999(2000个9)
9+99+999+9999+······+9999·9999(2000个9)
=(10-1)+(100-1)+...+(100..000-1)【2000个0】
=111...1【2000个1】-2000*1
=111...109111【前面是1995个连续的1】
请点击下面的【选为满意回答】按钮,
(2000个1)11...110(2000个)-2000
=(1996个1)11...1109110
9+99+999+9999+······+9999·9999
=(10-1)+(100-1)+(1000-1)+...+(10000.0000-1)
=11111111.1111111110-2000
=11111111111.111109110