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题目(苏科版七年级第二章书后复习题第17题)桌子上有3只杯口都朝上的茶杯,每次翻转2只,能否经过若干次翻转使它们翻成杯口全部朝下?7只杯口朝上的茶杯,每次翻转3只呢?能否经过若干次翻转使它们翻成杯口全部朝下?
Topic (Suksu’s 7th grade second chapter review questions Question 17) There are 3 teacups with cups facing upwards. Each time you flip 2, you can turn them into cups after several flips. Under 7 cups with cups facing upwards, flip 3 at a time. Can you turn them over and turn them upside down several times?