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s.a = s.b + 3 ..........pers.1
- = 234
= + 234 ..........pers.2
Substitusi ke pers.1
= + 234
9 + 6 s.b + = + 234
6 s.b = + 234 - 9 -
6 s.b = 225
s.b = 225 ÷ 6
s.b = 37,5 dm
Substitusi ke pers.1
s.a = s.b + 3
s.a = 37,5 + 3
s.a = 40,5 dm
Selisih volume:
s.a³ - s.b³
= 40,5³ - 37,5³
= 66.430,125 - 52.734,375
= 13.695,75 dm³
Keterangan:
s.a = rusuk kubus A
s.b = rusuk kubus B