Jawabanmu

2014-05-23T16:43:57+07:00
468 = 2. 4x.2x+2.4x.3x+2.3x.2x
468 = 16 x kuadrat +24 x kuadrat + 12 x kuadrat
468 = 52 x kuadrat
9 = x kuadrat
3 = x
panjang = 4.3 = 12 cm
lebar = 3.3 = 9 cm
tinggi = 2.3 = 6 cm
volume = 12.6.9
= 648 cm3
2014-05-23T17:03:57+07:00
Misal tinggi=t, maka luas permukaan balok=2*(p*l+l*t+p*t) 468=2*(4t*3t+3t*2t+4t*2t) 468= 2 (26t^2)
26t^2=234 
t^2= 9
t= 3cm. sehingga p=4t=12cm dan l=3t=9cm