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3³;-4*3²;+10*3=21=7*3 3的4次方-4*3³;+10*3²;= 63=7*3²; 3的5次方-4*3^4+10*3³;=189=7*3³; . 3^(n+2)-4*3^(n+1)+10*3^n=7*3^n
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