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√（a-b)²/(√a-√b )
=(a-b)/(√a-√b )
=(a-b)(√a+√b)/(√a-√b )(√a+√b)
=(a-b))(√a+√b)/(a-b)
=√a+√b (a＞b＞0)
√（a-b)²/(√a-√b )
=-(a-b)/(√a-√b )
=-(a-b)(√a+√b)/(√a-√b )(√a+√b)
=-(a-b))(√a+√b)/(a-b)
=-√a-√b (0＜a＜b)
=(a-b)/(√a-√b )
=(a-b)(√a+√b)/(√a-√b )(√a+√b)
=(a-b))(√a+√b)/(a-b)
=√a+√b (a＞b＞0)
√（a-b)²/(√a-√b )
=-(a-b)/(√a-√b )
=-(a-b)(√a+√b)/(√a-√b )(√a+√b)
=-(a-b))(√a+√b)/(a-b)
=-√a-√b (0＜a＜b)
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