Jawabanmu

2014-05-21T20:35:45+07:00
P : l : t = 2 : 3 : 4

p : l = 2 : 3
p/l = 2/3
l = 3/2 p

p : t = 2 : 4
p / t = 1 / 2
t = 2p

luas permukaan persegi = 2 (pl + pt + lt)
208 = 2 (p.3/2 p + p.2p + 3/2 p . 2p)
104 = 3/2 p² + 2p² + 3p²
104 = 1/2 (3p² + 4p² + 6p²)
208 = 13p²
16 = p²
4 = p

t = 2p
t = 8

l = 3/2 p
l = 6

V = p.l.t
V = 4.8.6
V = 192 cm³
2014-05-21T20:41:28+07:00
2(2p.3p)+2(2p.4p)+2(3p.4p)=208
12²p+16²p+24²p=208
52p²=208
p²=4
p=2

p=2p= 4
l=3p= 6
t=4p= 8
v= 4x6x8 = 192 cm³