99.9+999×9.9(巧算) =

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99.9+999×9.9(巧算)=99.9+999×9.9(巧算)=99.9+999×9.9(巧算)=99.9+999x9.9=99.9x(9.9+0.1)=99.9x10=999

99.9+999×9.9(巧算) =
99.9+999×9.9(巧算) =

99.9+999×9.9(巧算) =
99.9+999x9.9=99.9x(9.9+0.1)=99.9x10=999