推 biox:對~ 61.216.233.154 07/21 19:33
→ axionelment:多謝^^! 61.216.243.175 07/21 20:50
The interval of convergence of the power series
00 n(x+2)^n
E ---------- (E是西格馬....)
0 5^n
請問答案是-7<X<3嗎...?
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