巧算题求解1991+199.1+19.91+1.991

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巧算题求解1991+199.1+19.91+1.991
巧算题求解
1991+199.1+19.91+1.991

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

(2000+200+20+2)-(9+0.9+0.09+0.009)
=2222-9.999
=2212.001