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U9 = a + 8b = 4
---------------------- -
-5b = -15
b = 3
a + 8b = 4
a + 8(3) =4
a =4 - 24
a = -20
U7 = a + 6b
= -20 + 6(3)
= -20 + 18
= -2
semoga membantu:)
( 4 + 11 ) : ( 9 - 4 ) = 3
Cari awal :
-11 = a + 3b
-11 = a + 9
a = -20
Maka, suku ke 7 :
U₇ = a + 6b
= -20 + 6 × 3
= -2