丨1/102-1/101丨丨1/103-1/102丨-丨1/103-1/101丨=

日期：2021-06-28 11:21:30 人气：1

丨1/102-1/101丨+丨1/103-1/102丨-丨1/103-1/101丨
=(1/101-1/102)+(1/102-1/103)-(1/101-1/103)
=1/101-1/102+1/102-1/103-1/101+1/103
=0