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= 2(70+50)
= 2(120)
= 240
= 7x . 5x = 3500 m"
= 35 X" = 3500 m"
= X" = 3500 ÷ 35 = 100
= X = \/100 (akar100)
= 10
=》P = 7 . 10 = 70
L = 5 . 10 = 50
=》 K = 2 . (P + L)
= 2 . ( 70 + 50)
= 2 . 120
= 240