问题 解答题

80-9-0.9-0.09-0.009-0.0009.

答案

80-9-0.9-0.09-0.009-0.0009,

=80-(9+0.9+0.09+0.009+0.0009),

=80-9.9999,

=80-(10-0.0001),

=80-10+0.0001,

=70.0001.

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