x5xi的知识精选

设*A={(x1,x2,x3,x4,x5)|xi∈{-1,0,1},i=1,2,3,4,5},那么*A中满...
问题详情:设*A={(x1,x2,x3,x4,x5)|xi∈{-1,0,1},i=1,2,3,4,5},那么*A中满足条件“1≤|x1|+|x2|+|x3|+|x4|+|x5|≤3”的元素的个数为                                  ()A.60            ...
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