ๅทฒ็ฅ๐_๐โ๐, ๐1โค๐2โค๐3โค๐4โคโฆโค๐_(๐โ3)โค๐_(๐โ2)โค๐_(๐โ1)โค๐_๐๏ผไธๅฎๆน็จโ24_(๐=1)^๐โ๐_๐ = โ24_(๐=1)^๐โ๐_๐ ๆญฃๆดๆธ่งฃ็ๆข่จ
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2018-12-??
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ๅ็ซ่บ็ฃๅธซ็ฏๅคงๅญธ็งๅญธๆ่ฒไธญๅฟ
Science Education Center,National Normal University
Science Education Center,National Normal University