dik : u10=30 U20=50 berapa rumus suku n
Matematika
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Pertanyaan
dik : u10=30 U20=50 berapa rumus suku n
2 Jawaban
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1. Jawaban dharmawan14
U10 = a + 9b ,= 30
U20= a + 19b = 50
---- -------- --- ---------- -
-10b = -20
b = 2
a + 9b = 30
a + 9.2 = 30
a +18 = 30
a = 12
Un = a +(n - 1)b
Un = 12 + (n - 1).2
Un = 12 + 2n - 2
Un = 2n + 10 -
2. Jawaban alikilat
b = 2
U10 = a + 9b = 30 ⇒ a + 9(2) = 30 ⇒ a = 12
Un = a + ( n-1 ) b
= 12 + ( n - 1 ) 2
= 12 + 2n - 2
Un = 2n + 10
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