想一想,怎样计算简便?1999+199.9+1.999+1.111

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想一想,怎样计算简便?1999+199.9+1.999+1.111
想一想,怎样计算简便?1999+199.9+1.999+1.111

想一想,怎样计算简便?1999+199.9+1.999+1.111
1999+199.9+1.999+1.111
=1999+199.9+1.999+1+0.1+0.01+0.001
=1999+1+199.9+0.1+1.999+0.001+0.01
=2000+200+2+0.01
=2202.01

1999+199.9+1.999+1+0.1+0.01+0.001
=(1999+1)+(199.9+0.1)+(1.999+0.001)+0.01
=2000+200+2+0.01
=2202.01

1999+199.9+1.999+1.111
=(1999+1)+(199.9+0.1)+(1.999+0.001)+0.01
=2000+200+2+0.01
=2202.01

1999+1+199.9+0.1+1.999+0.001+0.01=2000+200+2+0.01=2202.01