399999+39999+3999+399+39+3怎样运用简便运算
1个回答
2013-09-12
展开全部
399999+39999+3999+399+39+3
= 399999+1+39999+1+3999+1+399+39
=400000+40000+4000+438
=444438
= 399999+1+39999+1+3999+1+399+39
=400000+40000+4000+438
=444438
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