作业帮问一道计算题3999999+399999+39999+3999+399+39+9请把过程写下来!要求巧算!
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/27 09:43:24
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问一道计算题3999999+399999+39999+3999+399+39+9请把过程写下来!要求巧算!
问一道计算题
3999999+399999+39999+3999+399+39+9
请把过程写下来!要求巧算!
问一道计算题3999999+399999+39999+3999+399+39+9请把过程写下来!要求巧算!
3999999+399999+39999+3999+399+39+9
=4000000-1+400000-1+40000-1+4000-1+400-1+40-1+10-1
=44444450-7
=44444443
4000000-1+400000-1+40000-1+4000-1+400-1+40-1+10-1=4444440+10-7=4444443
4000000+400000+40000+4000+400+40+10-7=4444443
3999999+399999+39999+3999+399+39+9
=4000000+400000+40000+4000+400+40+3
=4444443
3999999=4000000-1
399999=400000-1
同理
上市和为4444444-6+10-1=4444447
=(3999999+1)+(399999+1)+(39999+1)+(3999+1)+(399+1)+(39+1)+(9+1)-7
=4444440-7=4444433