9.9+99.9+999.9+9999.9求巧算

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9.9+99.9+999.9+9999.9求巧算9.9+99.9+999.9+9999.9求巧算9.9+99.9+999.9+9999.9求巧算9.9+99.9+999.9+9999.9=(10-0.

9.9+99.9+999.9+9999.9求巧算
9.9+99.9+999.9+9999.9求巧算

9.9+99.9+999.9+9999.9求巧算
9.9+99.9+999.9+9999.9
=(10-0.1)+(100-0.1)+(1000-0.1)+(10000-0.1)
=11110-0.4
=11109.6