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一、 (11/12)/a*2/5=3/8 (11/12)/a=3/8*5/2 11/12=15a/16 15a=11/12*16 a=44/3*1/15 a=44/45 二、 (11/12)/(a*2/5)=3/8 11/12=3/8*2a/5 11/12=3a/20 a=11/12*20/3 a=55/9
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