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标题: prep里的数学题.... [打印本页]

作者: pilipala711 时间: 2010-9-22 07:05 标题: prep里的数学题....

DS: If ab≠0 and point (-a,b) and (-b,a) are in the same quadrant of the xy-plane, is point (-x,y) in this quadrant?
1. xy＞0
2. ax＞0
这题没看明白什么意思

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