#1
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͹ءÃÁËÅÒªÑé¹
¼Áä»àÃÕ¹·Õè¡Ç´ÇÔªÒÁÒ¤ÃѺ áÅéÇÍÒ¨ÒÃÂìãËéÊÙµÃÁÒ¤×Í
͹ءÃÁ 1 ªÑé¹ a[n] = a1 + (n-1)d ͹ءÃÁ 2 ªÑé¹ a[n] = a1 + (n-1)d1 + (n-1)(n-2)d2/2! ͹ءÃÁ 3 ªÑé¹ a[n] = a1 + (n-1)d1 + (n-1)(n-2)(n-3)d3/3! à»ç¹àªè¹¹ÕéàÃ×èÍÂæ ¡ÑºÍ¹Ø¡ÃÁ 4,5,6,... ªÑé¹ ÍÂҡú¡Ç¹ãËéªèǾÔÊÙ¨¹ìÊٵùÕé·Õ¤ÃѺ ¼Á¾ÔÊÙ¨¹ìä´é¶Ö§á¤è 2 ªÑé¹ áµè 3,4,.. ªÑé¹¾ÔÊÙ¨¹ìäÁèä´éáÅéÇ »Å. dn ¤×ͼŵèÒ§áá¢Í§ªÑé¹·Õè n ¹Ð¤ÃѺ |
#2
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