1.9+0.99+0.999+.+0.999999999+0.9999999999=多少?

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1.9+0.99+0.999+.+0.999999999+0.9999999999=多少?1.9+0.99+0.999+.+0.999999999+0.9999999999=多少?1.9+0.99+0

1.9+0.99+0.999+.+0.999999999+0.9999999999=多少?
1.9+0.99+0.999+.+0.999999999+0.9999999999=多少?

1.9+0.99+0.999+.+0.999999999+0.9999999999=多少?
=2-0.1
+ 1-0.01
+ 1-0.001
+...
+1-0.000000001
+1-0.0000000001
= 11-0.1111111111
=10.8888888889

1.9+0.99+0.999+.....+0.999999999+0.9999999999=(2-0.1)+(1-0.01)+(1-0.001)+…+(1-0.0000000001)
=2+1+1+1+1+1+1+1+1+1-(0.1+0.01+……+0.0000000001)
=11-0.1111111111
=10.8999999999

10.8888888889