(1/2+1/3+1/5+1/7+1/11+1/13)*385

问题描述:

(1/2+1/3+1/5+1/7+1/11+1/13)*385
用分数表达得数

1/2+1/3+1/13)*385+(1/5+1/7+1/1/11)*385
=192/2+128/3+29*8/13+77+55+35
=516+1/2+1/3+8/13
=517+35/78
=517 78分之35