问题 解答题

853+854+855+856+857+858+859

=856×______

=______.

答案

853+854+855+856+857+858+859

=(856-3)+(854-2)+(856-1)+856+(857+1)+(858-2)+(859-3)

=856×7+(1+2+3-1-2-3)

=856×7

=5992

故答案为:7、5992.

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