9999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999999999999999999999999999...
999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999乘999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999等于多少
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999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999
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999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999X999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999
=(10^111-1)^2
=10^222-2X10^111+1
=1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000-2000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000+1
= 999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999998000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001
=(10^111-1)^2
=10^222-2X10^111+1
=1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000-2000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000+1
= 999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999998000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001
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