数学机井29题有错误？

sdtifa

since (2) tell us that y/x>0, it means that either x or y is negative. so you can answer the question is X/Y>0

ur answer will be no, x/y is not > 0. cuz  x/y is <0

[此贴子已经被作者于2009-2-24 9:25:10编辑过]