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l=3x =3.3=9
t=2x = 2.3=6
v=810cm³
p.l.t=810
5x.3x.2x=810
30x³=810
x³=810:30
x³=27
x=3
lp balok=2(pl+pt+lt)=2(15.9+15.6+9.6)=2(135+90+54)=2(279)=558cm²