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10.935 = a .
10.935 = a . 2187
a =
a = 5
U5 = a .
= 5 .
= 5 . 81
= 405
u8=10.395
10.395=ar^7
10.395=2187a
385=81a
385/81=a
U5=ar^4
=385/81*3^4
=385