简算题1991+199.1+19.91+1.991=

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简算题1991+199.1+19.91+1.991=

简算题1991+199.1+19.91+1.991=
简算题1991+199.1+19.91+1.991=

简算题1991+199.1+19.91+1.991=
2000+200+20+2-(9+0.9+0.09+0.009)
=2222-10+0.001
=2212.001