解ï¼12â 21
= [12,21] - (12,21)
= 84 - 3
= 81
6âX=27
= [6,X] - (6,X) 令(6,X) = T,å
6X - T² = 27T
T² = 6X - 27T = 3(2X - 9T)
æ¾ç¶T²è½è¢«3ã9æ´é¤.åTè½è¢«3æ´é¤,åTæ¯6çå æ°,å æ¤T=3æ6
â å½T = 3æ¶
6X - T² = 27T å³6X - 9 = 81,X = 15
â¡å½T = 6æ¶
6X - T² = 27T å³6X - 36 = 162,X = 33
æ¤æ¶6ã33çæ大å
¬çº¦æ°â 6,èå¼
解å¾X = 15
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