(11+12+13+14+15+16+17)/7怎样简算
问题描述:
(11+12+13+14+15+16+17)/7怎样简算
答
(11+12+13+14+15+16+17)/7=(11+17)/7+(12+16)/7+(13+15)/7+14/7
=28/7+28/7+28/7+14/7
=4+4+4+2
=14