ä½ è¿ä¸ªé¢ç®æé®é¢å§ã
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a1+a3 = a1+a1*k^2=a1*(1+k²)=5 â´
a2+a4=a1*k+a1*k³=a1*k*(1+k²)=5 âµ
âµ-â´ å¾ a1*(k-1)(1+k²)=0
âµ 1+k² >0
åâµa1â 0
â´ k=1
k=1é£ä¹æ°åææçæ°é½æ¯ä¸ä¸ªæ°ï¼å³a1=a2=a3=â¦â¦=an=2.5
é£ä¹a4+a6=2a1=5
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