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(12+2)(8+2)(5+2)-12×8×5
14×10×7-480
980-480
500 cm³
B.)10 mm=1 cm
12×8×5-(12-1)(8-1)(5-1)
480-11×7×4
480-308
172 cm³
lebar: 8cm+(20mm=2cm)=10cm
tinggi: 5cm +(20mm=2cm)=7cm
V=p×l×t
=14×10×7
=980cm