223) if xy=/0 and x^2*y^2-xy=6, which of the following could be y in term of x? (I). 1/2x (II) –2/x (III) 3/x 参考答案:.II, III (作者選 I.II.III) 思路: xy=/0何意?如是不等于0,那他在这题里有没有都没关系吧?
以下是引用xianwharton在2003-9-21 19:17:00的发言: 223) if xy=/0 and x^2*y^2-xy=6, which of the following could be y in term of x? (I). 1/2x (II) –2/x (III) 3/x 参考答案:.II, III (作者選 I.II.III) 思路: xy=/0何意?如是不等于0,那他在这题里有没有都没关系吧?