Jawabanmu

2014-05-20T21:59:32+07:00
192 = 3x+3x+x+x
192=8x
24=x
luas = 72.24
= 1728
1728.425000
=734400000
2014-05-20T22:01:58+07:00
P=3l
  =3×14
  = 52cm
l = 14cm

K=2(p+l)
192cm=2(3l+l)
192/2=4l
96cm=4l
96/4=l
14=l

Luas= p×l
     =52×14cm²
     =728cm²

harga = 728×Rp 425.000
         =Rp 309.400.000
maaf sebelumnya kalo salah :)