(1/6一2/7十2/3)/(一5/42)

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(1/6一2/7十2/3)/(一5/42)(1/6一2/7十2/3)/(一5/42)(1/6一2/7十2/3)/(一5/42) 

(1/6一2/7十2/3)/(一5/42)
(1/6一2/7十2/3)/(一5/42)

(1/6一2/7十2/3)/(一5/42)