已知xy＞0,化简x根号-y/x²的值

已知xy＞0,化简x根号-y/x²的值
已知xy＞0,化简x根号-y/x²的值

已知xy＞0,化简x根号-y/x²的值
xy＞0
而 √(-y/x²) 有意义
所以 y＜0 x＜0
x√(-y/x²)
= x√-y/（-x）
= -√-y