锟斤拷锟斤拷锟饺差數(sh锟斤拷)锟斤拷锟角革拷锟叫旓拷(sh锟斤拷)锟絎锟叫碉拷一锟斤拷锟斤拷要锟斤拷(n锟斤拷i)锟斤拷锟斤拷锟斤拷么锟斤拷锟饺差數(sh锟斤拷)锟斤拷锟斤拷锟斤拷些锟斤拷式锟斤拷锟斤拷锟斤拷锟斤拷锟叫★拷锟揭伙拷锟斤拷锟斤拷锟斤拷锟斤拷锟�锟斤拷

锟斤拷锟斤拷1锟饺差數(sh锟斤拷)锟斤拷锟斤拷凸锟绞斤拷锟斤拷锟叫�

锟斤拷锟斤拷锟饺差數(sh锟斤拷)锟叫癸拷式an=a1+(n-1)d

锟斤拷锟斤拷前n項和癸拷式锟介：Sn=na1+n(n-1)d/2

锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷d=1锟絩锟斤拷Sn=(a1+an)n/2

锟斤拷锟斤拷锟斤拷m+n=p+q锟絫锟斤拷锟斤拷锟斤拷am+an=ap+aq

锟斤拷锟斤拷锟斤拷m+n=2p锟絫锟斤拷am+an=2ap

锟斤拷锟斤拷锟斤拷n項碉拷值an=锟斤拷锟�+锟斤拷項旓拷(sh锟斤拷)-1锟斤拷×锟斤拷锟斤拷

锟斤拷锟斤拷前n項的猴拷Sn=锟斤拷锟�+末锟�×項旓拷(sh锟斤拷)(項旓拷(sh锟斤拷)-1锟斤拷锟斤拷锟斤拷/2

锟斤拷锟斤拷锟斤拷锟斤拷d=(an-a1)÷锟斤拷n-1锟斤拷

锟斤拷锟斤拷項旓拷(sh锟斤拷)=锟斤拷末锟�-锟斤拷項ｏ拷÷锟斤拷锟斤拷+1

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