1991+199.1+19.91+1.991

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1991+199.1+19.91+1.9911991+199.1+19.91+1.9911991+199.1+19.91+1.9911991+199.1+19.91+1.991=1991×(1+0.1

1991+199.1+19.91+1.991
1991+199.1+19.91+1.991

1991+199.1+19.91+1.991
1991+199.1+19.91+1.991
=1991×(1+0.1+0.01+0.001)
=1991×1.111
=(2000-9)×1.111
=2000×1.111-9×1.111
=2222-9.999
=2222-10+0.001
=2212+0.001
=2212.001

1991+199.1+19.91+1.991
=(2000-9)+(200-0.9)+(20-0.09)+(2-0.009)
=2222-9.999
=2222-(10-0.001)
=2222-10+0.001
=2212.001

1991+199.1+19.91+1.991
=1.991*(1000+100+10+1)
=1111*1.991
=2212.001