A = 3
U5 + U8 = 61
tentukan U30 & S25 !!
yg tau jawab ya.. ini bab aritmatika
U5 + U8 = 61
tentukan U30 & S25 !!
yg tau jawab ya.. ini bab aritmatika
hoji
Un = a + (n - 1)b a = 3 U5 + U8 =61 (3 + 4b) + (3 + 7b) = 61 6 + 11b = 61 11b = 55 b = 5 U30 = 3 + (30-1) 5 = 3 + (29) 5 = 3 + 145 = 147 Sn = n/2 (2a + (n -1)b) S25 = 25/2 (6 + (24)5) = 25/2 (6 + 120) = 25 (63) = 1575
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Thanks 1
pristianti
mksh,, mau ngingetin 3+145 = 148 :D
hoji
Oia..maaf ya salah tulis