用简便方法计算:1991+199.1+19.91+1.991
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用简便方法计算:1991+199.1+19.91+1.991用简便方法计算:1991+199.1+19.91+1.991用简便方法计算:1991+199.1+19.91+1.9911991+199.1
用简便方法计算:1991+199.1+19.91+1.991
用简便方法计算:1991+199.1+19.91+1.991
用简便方法计算:1991+199.1+19.91+1.991
1991+199.1+19.91+1.991
=2000+200+20+2-(9+0.9+0.09+0.009)
=2222-10+0.001
=2212.001