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1620 = 60x³
1620/60 = x³
27 = x³
x = 3
ukuran balok p= 5.3=15, l= 4.3=12, t=3.3=9
60x^3=1620
x^3=1620/60
x^3=27
x=akar pangkat 3 dr 27
x=3
5x=5(3)=15 cm
4x=4(3)=12 cm
3x= 3(3)=9 cm