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4/9 :5/12 *15/28=4/9 *12/5 *15/28=720/1260=4/7
2/7*14/30:4/25*1/10=28/210*25/4*1/10=1/12
6/11:(4/7*14/33)=6/11 : 56 /231=6/11*231/56=9/4=2,25