(1+1/2+1/3+4/1+1/5+1/6)*(1/2+1/3+1/4+1/5+1/6+1/7)-(1-1/2+1/3+1/4+1/5+1/6+1/7)*(1/2+1/3+1/4+1/5+1/6)、桃树的5/8与杏树的5/12相等,桃树与杏树的比是多少?杏树是桃树的几分之几?一种商品按原价出售,每件利润是
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