1-9/14+8/21+1/14-17/35-3又6/7=
问题描述:
1-9/14+8/21+1/14-17/35-3又6/7=
答
1-9/14+8/21+1/14-17/35-3又6/7
=1-8/14+8/21-17/35-27/7
=3/7+8/21-17/35-27/7
=1/105*(45+40-51-27*15)
=1/105*(31-405)
=-374/105
=-3又59/105