(-13又1/3)*1/5+(-6又2/3)*1/5+(-196又1/7)/5-(-76又1/7)/5
=(-13又1/3)*1/5+(-6又2/3)*1/5+(-196又1/7)*1/5-(-76又1/7)*1/5
=[(-13又1/3)+(-6又2/3)+(-196又1/7)-(-76又1/7)]*1/5
=-140*1/5
=-28
(-13又1/3)*1/5+(-6又2/3)*1/5+(-196又1/7)/5-(-76又1/7)/5
=(-13又1/3)*1/5+(-6又2/3)*1/5+(-196又1/7)*1/5-(-76又1/7)*1/5
=[(-13又1/3)+(-6又2/3)+(-196又1/7)-(-76又1/7)]*1/5
=-140*1/5
=-28