1,2,3,4,5,

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1,2,3,4,5,

1,2,3,4,5,
1,2,3,4,5,
 

1,2,3,4,5,
1 15
2 (-wuqiong,11]
3 (2,16)cm
4 -23/4
5 60
6 x=(12+6y)/5 0
y=(5x-12)/6 -2