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ÕâÊÇÒ»¸ö¹ØÓÚÏòÁ¿¿Õ¼äµÄ¾­µäÁ·Ï°: ¸ø³ö n ÖеÄÒ»¸öлù calB ÒÔ¼°ÀûÓà n µÄ±ê×¼»ù¸ø³öµÄÏòÁ¿ U (Ò»¸ö n ÔªÊý×é), ÄãÓ¦¸ÃÕÒµ½ U ÔÚ»ù calB ϵÄ×ø±ê. Ò²¾ÍÊÇ˵, Èç¹û calB = (V 1,...,V n) Çó³öʵÊý c i (i=1...n) ËüÃÇÂú×ã :
U= i nc iV i.

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