负3又5/1+10又11/6-12又22/1+4又15/7
=-3-1/5+10+6/11-12-1/22+4+7/15
=-1-3/15+7/15+12/22-1/22
=-1+4/15+1/2
=-1+8/30+15/30
=-1+23/30
=-7/30
负3又5/1+10又11/6-12又22/1+4又15/7
=-3-1/5+10+6/11-12-1/22+4+7/15
=-1-3/15+7/15+12/22-1/22
=-1+4/15+1/2
=-1+8/30+15/30
=-1+23/30
=-7/30