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U7/U1=a.r pangkat 6
320/5=r pangkat 6
64=r pangkat 6
r=2
S7=a. r pangkat 7 - 1/r - 1
=5.128-1/2-1
=635 cm
320 : 5 =
64 =
r =
r = 2
Maaf kalau ada kesalahan