2025锟斤拷呖锟斤拷锟�(sh锟斤拷)锟絎(xu锟斤拷)锟饺差數(sh锟斤拷)锟斤拷锟斤拷凸锟绞斤拷锟斤拷Y(ji锟斤拷)

锟斤拷源锟斤拷锟絎(w锟斤拷ng)锟絡(lu锟斤拷)锟斤拷锟斤拷 2024-11-13 11:26:19

[锟斤拷(bi锟斤拷o)锟斤拷锟斤拷2025锟斤拷锟竭匡拷锟斤拷(sh锟斤拷)锟絎(xu锟斤拷) 锟斤拷(sh锟斤拷)锟絎(xu锟斤拷)知锟絉(sh锟斤拷)锟絚(di锟斤拷n)]

锟斤拷锟斤拷锟斤拷(sh锟斤拷)锟絎(xu锟斤拷)锟侥學(xu锟斤拷)锟斤拷(x锟斤拷)锟斤拷要锟揭傦拷記住锟斤拷锟絅锟斤拷式,锟紷锟角旓拷(sh锟斤拷)锟絎(xu锟斤拷)锟斤拷锟絵锟侥伙拷锟紸(ch锟斤拷)锟斤拷锟斤拷锟斤拷小锟斤拷锟斤拷锟斤拷锟结供锟饺差數(sh锟斤拷)锟斤拷锟斤拷凸锟绞斤拷锟斤拷Y(ji锟斤拷),锟斤拷锟斤拷覅锟斤拷锟�锟斤拷

锟斤拷锟斤拷锟斤拷式 Sn=(a1+an)n/2

锟斤拷锟斤拷Sn=na1+n(n-1)d/2; (d锟介公锟斤拷)

锟斤拷锟斤拷Sn=An2+Bn; A=d/2,B=a1-(d/2)

锟斤拷锟斤拷锟酵烇拷 Sn

锟斤拷锟斤拷锟斤拷锟�(xi锟斤拷ng) a1

锟斤拷锟斤拷末锟�(xi锟斤拷ng) an

锟斤拷锟斤拷锟斤拷锟斤拷d

锟斤拷锟斤拷锟�(xi锟斤拷ng)锟斤拷(sh锟斤拷)n

锟斤拷锟斤拷通锟�(xi锟斤拷ng)

锟斤拷锟斤拷锟斤拷锟�(xi锟斤拷ng)=2×锟斤拷÷锟�(xi锟斤拷ng)锟斤拷(sh锟斤拷)-末锟�(xi锟斤拷ng)

锟斤拷锟斤拷末锟�(xi锟斤拷ng)=2×锟斤拷÷锟�(xi锟斤拷ng)锟斤拷(sh锟斤拷)-锟斤拷锟�(xi锟斤拷ng)

锟斤拷锟斤拷末锟�(xi锟斤拷ng)=锟斤拷锟�(xi锟斤拷ng)+(锟�(xi锟斤拷ng)锟斤拷(sh锟斤拷)-1)×锟斤拷锟斤拷

锟斤拷锟斤拷锟�(xi锟斤拷ng)锟斤拷(sh锟斤拷)=(末锟�(xi锟斤拷ng)-锟斤拷锟�(xi锟斤拷ng))(锟斤拷锟斤拷)/ 锟斤拷锟斤拷+1

锟斤拷锟斤拷锟斤拷锟斤拷=锟斤拷:1+3+5+7+……99 锟斤拷锟斤拷锟斤拷锟�3-1

锟斤拷锟斤拷d=an-a

锟斤拷锟斤拷锟斤拷锟絴(zh锟斤拷):

锟斤拷锟斤拷锟斤拷 m锟斤拷n锟斤拷p锟斤拷q∈N

锟斤拷锟�锟斤拷锟斤拷锟絤+n=p+q,锟絫am+an=ap+aq

锟斤拷锟�锟斤拷锟斤拷锟絤+n=2q,锟絫am+an=2aq

锟斤拷锟斤拷注锟斤拷:锟斤拷锟斤拷锟斤拷式锟斤拷an锟斤拷示锟饺差數(sh锟斤拷)锟叫的碉拷n锟�(xi锟斤拷ng)锟斤拷

锟斤拷锟絇(gu锟斤拷n)锟斤拷锟絔锟斤拷

锟斤拷锟斤拷锟竭匡拷锟斤拷(sh锟斤拷)锟絎(xu锟斤拷)知锟絉(sh锟斤拷)锟絚(di锟斤拷n)锟絉锟斤拷

锟斤拷锟铰高匡拷锟結訊锟斤拷锟竭匡拷锟斤拷锟斤拷锟斤拷锟斤拷前锟斤拷(zh锟斤拷n)锟斤拷锟斤拷志愿锟斤拷锟�(b锟斤拷o)锟斤拷锟饺★拷锟�?j锟斤拷n)?sh锟斤拷)锟斤拷锟斤拷

锟竭匡拷锟絩(sh锟斤拷)锟絞锟斤拷锟斤拷全锟斤拷锟斤拷要锟斤拷(ji锟斤拷)锟絚(di锟斤拷n)

锟組锟斤拷"锟竭匡拷锟絎(w锟斤拷ng)"微锟脚癸拷锟斤拷號(h锟斤拷o)