999.9*999.9+1999.9 (2005个9) (2005个9) (2005个9)

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999.9*999.9+1999.9(2005个9)(2005个9)(2005个9)999.9*999.9+1999.9(2005个9)(2005个9)(2005个9)999.9*999.9+1999

999.9*999.9+1999.9 (2005个9) (2005个9) (2005个9)
999.9*999.9+1999.9 (2005个9) (2005个9) (2005个9)

999.9*999.9+1999.9 (2005个9) (2005个9) (2005个9)
999.9*999.9+1999.9 (2005个9) (2005个9) (2005个9)
=999.9*999.9(2005个9) (2005个9)+999.9(2005个9) +10……0(2005个0)
=999……900……0(2005个9)(2005个〇)+10……0(2005个0)
=10……0(4010个0)