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maka panjang kubus 2 adalah x+3
selisih luas permukaan = 234
luas kubus 2 - luas kubus 1 = 234
6(x+3)² - 6 (x)² = 234
6 ((x² + 6x +9 ) - x²) = 234
6x + 9 = 234/6
6x = 39 - 9
x = 30 /6 = 5
maka sisi kubus 1 = 5
sisi kubus 2 = 8
selisih v = v2 - v1
= 8*8*8 - 5*5*5
= 512 - 125 = 387
ITU CARANYA