ta có : 1/2 +1/2=1,2/3+1/3=1,3/4+1/4=1,4/5+1/5=1,5/6+1/6=1,6/7+1/7=1
mà 1/2 >1/3>1/4>1/5>1/6>1/7nên ta xếp như sau 1/2 ,2/3,3/4,4/5,5/6,6/7
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