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#1
30 ÁÕ¹Ò¤Á 2001, 17:04
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¶éÒà»ç¹¤Í¹àÇÍÃìਹµì¤ÓµÍºà»ç¹à·èÒäà 1.) 1/2+1/5+1/10+1/17+... 2.) 1+(1.2)/(1.3)+(1.2.3)/(1.3.5)+(1.2.3.4)/(1.3.5.7)+... ¡Ó˹´ a.b¤×Í a ¤Ù³ b 
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#2
30 ÁÕ¹Ò¤Á 2001, 17:09
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¢éÍ 2. ¹Õè¶éÒ¨Ðà»ÃÕºà·ÕºãËéàË繪ѴæàÅ ¤Ô´ÇèÒ¹èҨйÓÁÒà»ÃÕºà·Õº¡ÑºÍ¹Ø¡ÃÁ¹Õé
1 + (2/3) + (2/3)(2/3) + (2/3)(2/3)(2/3) + ... «Öè§àÃҨоºÇèÒ·Ø¡à·ÍÁ¢Í§ series ·Õèµéͧ¡Ò÷´Êͺ¨Ð¹éÍ¡ÇèÒ·Ø¡à·ÍÁ¢Í§ series ¹Õé(à·Õº¡Ñ¹à·ÍÁµèÍà·ÍÁ) «Öè§ series ¹Õé converge á¹è¹Í¹ ´Ñ§¹Ñé¹ series ã¹¢éÍ 2 ¹Õé¨Ö§ converge ´éÇÂ
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