tolong bantu jawab, pake cara

nomor 5
AB-AK/AK = BC/AB
15-AK/AK = 6/12
15-AK/AK = 1/2
2(15-AK) = AK
30 - 2AK = AK
30 = AK + 2AK
30 = 3AK
30/3 = AK
10 cm = AK

nomor 6
ST/PQ = RT/RP
ST/24 = 3/6+2
ST/24 = 3/8
8ST = 3 x 24
8ST = 72
ST = 72/8
ST = 9 cm

*semoga membantu. sukses selalu ^_^

5)
AK=15-X
15-x. 12
____ = ___
X. 6

15-x. 1
------- = ----
X. 2

》2(15-x)=x
》x=2(15-x)
》x=30-2x
》3x=30
》x=10

》AK=15cm-x
=15cm-10cm
=5cm