(dr-7)-13-13-(a-1)
ar-20=14-a
ar+a =
59r=15
-1
-2
Latar =34 a-1 ·ar-z ar=1
a=15151-34+15=0
a+ar=34
1.4.7
Zar-zarta=4
30r =45
2lar-2) = (a-1)+(ar-1) ar=15
r = 3
v (不合)
2ar-4=a+ar-8
c=ar=25#
8.設數列<an>的首項an=3,且滿足遞迴關係式an=2am-1+5,n22,n=N,試求一般項
an=3x2
2n+2
91=3
λ2=204+5
J
3X2
=
【小港高中】
n-1
2x2+54-5
x2+10+
