[(17*27+7)/27+(27*17+7)/17-(11*39+37)/39]/[(8*27+17)/27+(13*17+12)/17-(5*39+38)/39]
问题描述：
[(17*27+7)/27+(27*17+7)/17-(11*39+37)/39]/[(8*27+17)/27+(13*17+12)/17-(5*39+38)/39]
答
（17 7/27+27 7/17-11 37/39)/(13 12/17+8 17/27-5 38/39)=(16+34/27+26+24/17-10-76/39)/(13+8-5+12/17+17/27-38/39)=2*(8+13-5+12/17+17/27-38/39)/(13+8-5+12/17+17/27-38/39)=2