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160 cm = 4 ( 5X + 3X + 2X )
160 cm = 20X + 12X + 8X
160 cm = 40X
x = 4 cm
p = 5 x 4 = 20 cm
l = 3 x 4 = 12 cm
t = 2 x 4 = 8 cm
LSP balok = 2 ( pl + pt + lt)
= 2 { (20x12) + (20x8) + (12x8) }
= 2 ( 496)
= 992 cm²
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