di ketahui u4=12 dan u7=324 berap U20?

Bab Barisan dan Deret
Matematika SMP Kelas VIII

Geometri
r = ⁷⁻⁴√(U7 :U3)
  = ∛(324 : 12)
  = ∛27
  = 3

U20 = U7 x r¹³
        = 324 x 3¹³
        = 324 x 1.594.323
        = 516.560.652

Bab Barisan + Deret
Sekolah Menengah Pertama Kelas IX

r = [tex] ^{7-4} \sqrt{U7 : U3} [/tex]
r = [tex] \sqrt[3]{324:12} [/tex]
r = [tex] \sqrt[3]{27}[/tex]
r = 3

U20 = U7 x [tex] r^{13} [/tex]
U20 = U7 x [tex] 3^{13} [/tex]
U20 = 324 x 1.594.323
U20 = 516.560.652