解：原式=6/5-1/7
=42/35-5/35
=37/35
=1又2/35
1又1/5-1/7
=1+1/5-1/7
=1+7/35-5/35
=1又2/35
=6/5-1/7=(42-5)/35=37/35
=6/5-1/7
=(6*7)/(5*7)-(1*5)/(7*5)
=42/35-5/35
=(42-5)/35
=37/35
内容全部来源于网络收集，如有侵权，请联系网站删除！