读了《中小学数学》(小学版)2012年第1、2期《从“解一题”上升到“解一类”》一文,受益匪浅。该文主要研究了如下一道题的解题思路。有10只茶杯,杯口都朝上(用“↑”表示)摆在桌上。每次操作将其中任意3只茶杯同时翻转(杯口朝上的翻成杯口朝下,杯口朝下的翻成杯口朝上)。至少需几次这样的操作,才能使这10只杯子全部变成杯口朝下(用“↓”表示)?请用“↑”和“↓”表示几次操 Read the “primary and secondary mathematics” (primary school edition) in 2012 first and second period “from” solution of a problem “rose to ” solution of a “” “article benefited a lot. This paper mainly studies the following problem-solving ideas. There are 10 cups, cups are up (with ”↑“) on the table. Each operation will be any 3 of them simultaneously flip cup (Cup mouth turned up into the cup down, cup down into the cup upwards). At least several times such an operation, in order to make all 10 cups cup down (with ”↓“)? Please use ”↑“ and ”↓" said several times