Jawabanmu

2014-06-10T13:10:54+07:00
K = 2p + 2l 28 = 2(2x-5) + 2(x+1) 28 = 4x -10 +2x +2 6x = 36 X = 6
1 5 1
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2014-06-10T13:47:16+07:00
K= 2p+2l
28=2(2x-5)+2(x+1)
28=4x-10+2x+2
28=4x+2x-10+2
28=6x-8
6x=28+8
6x=36
x=36/6
x=6
1 5 1