=9999×8889+9999×1111
=9999×（8889+1111）
=9999×10000
=99990000
（2）9992+999
=999×999+999
=999×（999+1）
=999×1000
=999000
（3）9
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=9+
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=（9+99+999+9999+2）+（
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=10+100+1000+10000-4+2+2
=11110
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