Jawabanmu

2014-01-28T12:32:34+07:00
Jawaban no.1
a = (-2)
r = (-2)
Un =  ar^{n-1}
Un =  (-2).(-2)^{n-1}

tentukan 4 suku pertama dari barisan dg rumus suku ke-n berikut ini !
1. Un=n²
jawab :
U1 =
 1^{2} = 1
U2 =  2^{2} = 4
U3 = 3^{2} = 9
U4 =  4^{2} = 16

2. Un= 1 per 2n-1
jawab :
U1 =
 \frac{1}{2(1)-1} = 1
U2 =
 \frac{1}{2(2)-1} =  \frac{1}{3}
U3 =  \frac{1}{2(3)-1} =  \frac{1}{5}
U4 =  \frac{1}{2(4)-1} =  \frac{1}{7}

3. Un= (-1) pangkat n

jawab :
U1 = (-1)^{1} = -1
U2 = (-1)^{2} = 1
U3 = (-1)^{3} = -1
U4 = (-1)^{4} = 1