Jawabanmu

2014-05-08T09:16:56+07:00
K = 2 (x +x-5)
90 = 2 ( 2x-5)
90 = 4x - 10
100 = 4x
25 = x
Jawaban paling cerdas!
2014-05-08T09:19:11+07:00
Pertidaksamaan:
x + (x-5) + x + (x-5) ≤90
penyelesaian:
2x + x-5 + x-5 ≤ 90
4x ≤ 90 + 5 + 5
x ≤ 100 : 4 =25

p=25 cm
l =25 - 5 = 20 cm

  
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