2,3,4,5,6
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2,3,4,5,6
2,3,4,5,6
2,3,4,5,6
2.抽样调查
2 3 4 5 6
2+5+4-3-6
2,3,4,5,6
5+3-2+4-6
2,3,4,5,6,
2,3,4,5,6,
2,3,4,5,6,
2,3,4,5,6
2 3 4 5 6
2,3,4,5,6
2 3 4 5 6
2,3,4,5,6
(-5/4+5/6-3/2+11/4)/6/5
4/6+5/6+2/3
5/6×(3/4+2/5)
1/1=1 1/2+2/2+1/2=21/3+2/3+3/3+2/3+1/3=31/4+2/4+3/4+4/4+3/4+2/4+1/4=41/5+2/5+3/5+4/5+5/5+4/5+3/5+2/5+1/5=51/6+2/6+3/6+4/6+5/6+6/6+5/6+4/6+3/6+2/6+1/6=6
5/4+6/5-3/2+6/1 /是分之
2 3 4 5 6 8 9