推 keith291 :a^n-b^n=(a-b)(a^(n-1)+a^(n-2)b+...+b^(n-1)) 03/22 20:44
(1)
----------------------------
/ n n-1 n-2
lim ( n / X + a1X + a2X +....an - X ) =?
x->inf \/
(2)Try to prove
感謝!
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