奥数速算7999 9997999+999+99+9+4=
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奥数速算7999 9997999+999+99+9+4=
奥数速算7999 999
7999+999+99+9+4=
奥数速算7999 9997999+999+99+9+4=
7999+999+99+9+4
=8000-1+1000-1+100-1+10-1+4
=9110
8000+1000+100+10=9110
=8000+1000+100+10+5-5
=9110
=8000+1000+100+10
=9110