1991+199.1+19.91+1.991+0.1991 怎么简便运算

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1991+199.1+19.91+1.991+0.1991怎么简便运算1991+199.1+19.91+1.991+0.1991怎么简便运算1991+199.1+19.91+1.991+0.1991怎

1991+199.1+19.91+1.991+0.1991 怎么简便运算
1991+199.1+19.91+1.991+0.1991 怎么简便运算

1991+199.1+19.91+1.991+0.1991 怎么简便运算
=1991*(1+0.1+0.01+0.001+0.0001)=1991*1.1111=(2000-9)*1.1111
=2222.2-9.9999=2222.2-10+0.0001=2212.0001

1991+199.1+19.91+1.991+0.1991=2000+200+20+2+0.2-9-0.9-0.09-0.009-0.0009
=2222.2-10+0.0001=2212.2001