① 765涓(82鍗165)鐢ㄧ亩渚挎庢牱绠楁墠鍙绠渚胯＄畻
棣栧厛锛岃傚疗鏁版嵁锛765-165=600锛岃繖镙峰瓙灏卞ソ璁＄畻澶氢简銆
涓昏佹秹鍙婂埌镄勫叕鍙稿备笅锛歛-(b+c)=a-b-c=a-c-b
765-锛82+165锛
=765-82-165
=765-165-82
=锛765-165锛-82
=600-82
=518