9999999999×11111111111
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9999999999×11111111111
9999999999×11111111111
9999999999×11111111111
9999999999×11111111111
=111111111098888888889
111111111098888888889
9999999999*10000000000
9999999999*1000000000
9999999999*100000000
9999999999*10000000
9999999999*100000
9999999999*10000
9999999999*1000
9999999999*100
9999999999*10
+ 9999999999*1
------------------------------……就行了
像是摆开卖火柴的
9999999999×11111111111=10000000000×11111111111-11111111111
=11111111111000000000-11111111111=111111111098888888889
9999999999×
(10000000000+1000000000+100000000+10000000+1000000+100000+10000+1000+100+10+1)=99999999990000000000+9999999999000000000+999999999900000000+99999999990000000+9999999999000000+999999999900000+99999999990000+9999999999000+999999999900+99999999990+9999999999=111111111111111111111（21个1）
11111111111×(10000000000-1)=111111111110000000000-11111111111=11111111109888888889