第1个回答 2016-11-16
2,4,5,3,8
z=xy。
每个数只能使用1次,
先确定3位数,选择3个数字,然后生育2个数字组成一个两位数,
C3 5=C2 5=10,
C22=1
10x1
共计10种选择法,
2,4,5,(3,8),zmax=542x83=44986,zmin=245x38=9310
2,4,3(5,8),zmax=432x85=36720,zmin=234x58=13572
2,4,8,(5,3)zmax=842x53=44626,zmin=248x35=8680
2,5,3,(4,8),zmax=532x84=44688,zmin=235x48=11280
2,5,8,(4,3),zmax=852x43=36636,zmin=258x34=8772
2,3,8,(4,5) zmax=832x54=44928,zmin=238x45=10710
4,5,3,(4,8),zmax=543x84=45612,zmin=345x48=16560
4,5,8,(2,3),zmax=854x32=27328,zmin=458x23=10534
4,3,8,(2,5),zmax=843x52=43836,zmin=348x25=8700
5,3,8,(2,4),zmax=853x42=35826,zmin=358x24=8592.
max=max{zmaxi}=45612,
min=8592.
答:
积最大是45612?积最小是8592.
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