10/(9/8/(7/6/5/4)/3/2)=3.1111111111117/6/5/4=7/1209/8/3/2/(7/120)=(9*120)/(8*3*2*7)=1080/33610/(1080/336)=3360/1080
3.1105581230003554920251526124194
914.2857143按计算器就好了
