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Jadi,saya jawab yang A saja.
A)
Suku 1 = ½(1)(1+4)
Suku 1 = 0,5(5)
Suku 1 = 2,5
Suku 2 =½(2)(2+4)
Suku 2 = 6
Suku 3=½(3)(3+4)
Suku 3 = 1,5(7)
Suku 3= 10,5
Suku 4 = ½(4)(4+4)
Suku 4=2(8)
Suku 4= 16
Suku 5 = ½(5)(5+4)
Suku 5 = 2,5 (9)
Suku 5 = 22,5