① 765涓(82鍗165)鐢ㄧ畝渚挎庢牱綆楁墠鍙綆渚胯＄畻
棣栧厛錛岃傚療鏁版嵁錛765-165=600錛岃繖鏍峰瓙灝卞ソ璁＄畻澶氫簡銆
涓昏佹秹鍙婂埌鐨勫叕鍙稿備笅錛歛-(b+c)=a-b-c=a-c-b
765-錛82+165錛
=765-82-165
=765-165-82
=錛765-165錛-82
=600-82
=518