作业帮9+99+999+9999+99999+999999=?
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9+99+999+9999+99999+999999=?
9+99+999+9999+99999+999999=?
9+99+999+9999+99999+999999=?
9+99+999+9999+99999+999999
=10-1+100-1+1000-1+10000-1+100000-1+1000000-1
=1111110-1x6
=1111110-6
=1111104
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9+99+999+9999+99999+999999
=10-1+100-1+1000-1+10000-1+100000-1+1000000-1
=1111110-6
=1111104
（10-1）+（100-1)+(1000-1)+(10000-1)+(100000-1)+(1000000-1)=1111110-6=1111104
9+99+999+9999+99999+999999
=（9+1）+（99+1）+（999+1）+（9999+1）+（99999+1）+（999999+1）-6
=1111110-6
=1111104