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其他解决方法
999999
999999=99÷9999.
99÷9999
99→990→9900→9009, 0099.
9909999=digit0,rema∈der990
990
99009999=digit0,rema∈der9900
9900
990009999=digit9,rema∈der9009
9009
900909999=digit9,rema∈der99
99
0.(0099)
99/9999=0.(0099)
(0099)=0.(0099).
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