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1 / 10 = 1/15 + 1/si
1/10 - 1/15 = 1/si
(3 - 2) / 30 = 1/si
1/30 = 1/si
30 cm = si
M = si / so = 30 / 15 = 2 kali
= -
=
Si = 30 cm
M =
= 2 kali
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