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1) 4*5+4*3+4*8=64cm
2) Pc = 2ac + 2bc + 2ab
Pc=2*5*8+2*3*8+2*5*3=80cm2+48cm2+30cm2=158cm2
3)V = abc
V=5*3*8=120cm3
3*5=15 8*5=40 8*3=24 15*2=30 40*2=80 24*2=48
P=48+30+80=158 centymetrów kwadratowych
V=8*5*3=40*3=120 centymetrów sześciennych