999.9+99.9+9.9+0.3=?
1个回答

999.9+99.9+9.9+0.3

=999.9+99.9+9.9+0.1+0.1+0.1

=(999.9+0.1)+(99.9+0.1)+(9.9+0.1)

=1000+100+10

=1110

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