Jawabanmu

Jawaban paling cerdas!
2014-02-10T19:53:54+07:00
K = 2 (p + l)
20 = 2 (x+1+6)
20 = 2 (x + 7)
20 = 2x + 14
2x = 20 - 14
x = 6/2
x = 3
1 5 1