Jawabanmu

2014-05-21T21:20:04+07:00
V balok = p x l x t
1296 = 3x . 2x . x 
1296 = 6x³
6x³= 1296
x³= 1296 : 6
x³ = 216
x = 8 
 
panjang = 3x = 3.8 = 24
lebar= 2x =  2.8 = 16 
tinggi = x = 8 

semoga membantu :)

2014-05-21T21:21:42+07:00
Volume Balok = PLT
1296 = 3x . 2x . x 
1296 = 6x³
x³ = 216 
x = ∛216
x = 6cm

A. Panjang Balok = 3x = 3 x ( 6 ) = 18cm

B. Lebar Balok = 2x = 2 x ( 6 ) = 12cm

C. Tinggi Balok = x = 6cm

D. Luas Permukaan Balok = 2 (pl + pt + lt)
Luas Perm. = 2 (18 x 12 + 18 x 6 + 12 x 6)
Luas Perm. = 2 ( 216 + 108 + 72 )
Luas Perm = 2 x 396
Luas Perm. = 792cm 

Semoga Benar ^^