853+854+855+856+857+858+859
=856×______
=______.
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.
853+854+855+856+857+858+859
=856×______
=______.
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.