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規律是a(n+1)=a(n)+2n 利用疊加法可以求出通項公式 直接觀察的話 a1=7=7+0*1 a2=9=7+1*2 a3=13=7+2*3 a4=19=7+3*4 ∴a(n)=7+n(n-1)
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