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p'=15(2/3)=10cm
l'=12(2/3)=8cm
t'=9(2/3)=6cm
V'= p*l*t
V' = 10m*8cm*6cm
V' = 280cm³
perubahan volume balok= V-V'= 1620cm³-280cm³=1340cm³
p = 15 p = 15 x 2/3 = 10
l = 12 l = 12 x 2/3 = 8
t = 9 t = 9 x 2/3 = 6
v= p x l x t v = p x l x t
= 15 x 12 x 9 = 10 x 8 x 6
= 1.620 cm3 = 480 cm3
perubahan/selisih = v1 - v2
= 1.620 - 480
= 1.140 cm3
semoga bener