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750 = p×l ×t
750 cm³= 3a×2a×1a
750 cm³ = 6a³
125 = a³
5 = a
panjang = 15 cm
lebar = 10 cm
tinggi = 5 cm
luas permukaan=2(p×l)+2(p×t)+2(l×t)
=2(15×10)+2(15×5)+2(10×5)
=300+150+100
=550 cm²