唔該教教我PLX..
更新1:
V = 2/3 x π(r-1)³ 1152π = 2/3 x π(r-1)³ 1728 = (r-1)³ 去到呢到我都識計.. 但想問下.. 點解無啦啦變左r = 13cm 你點整走個3次方???
更新2:
唉..我終於係計數機搵到個可以開方3既制啦-.-" 原來係shift+x3次果個制..thx哂