一减十分之九减一百分之九减一千分之九减一万分之九
=1-0.9-0.09-0.009-0.0009
=1-(0.9+0.09+0.009+0.0009)
=1-0.9999
=0.0001
1-9/10-9/100-9/1000-9/10000
=1-0.9-0.09-0.009-0.0009
=1-(0.9+0.09+0.009+0.0009)
=1-0.9999
=0.0001
1-9/10-9/100-9/1000-9/10000
=1-9×（0.1+0.01+0.001+0.0001）
=1-9×0.1111
=1-0.9999
=0.0001
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