根号xy除以x-y分之根号x+根号y 即:根号xy/(根号x+根号y)/(x-y)
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![根号xy除以x-y分之根号x+根号y 即:根号xy/(根号x+根号y)/(x-y)](/uploads/image/z/1985502-30-2.jpg?t=%E6%A0%B9%E5%8F%B7xy%E9%99%A4%E4%BB%A5x-y%E5%88%86%E4%B9%8B%E6%A0%B9%E5%8F%B7x%2B%E6%A0%B9%E5%8F%B7y+%E5%8D%B3%EF%BC%9A%E6%A0%B9%E5%8F%B7xy%2F%28%E6%A0%B9%E5%8F%B7x%2B%E6%A0%B9%E5%8F%B7y%29%2F%28x-y%29)
根号xy除以x-y分之根号x+根号y 即:根号xy/(根号x+根号y)/(x-y)
根号xy除以x-y分之根号x+根号y 即:根号xy/(根号x+根号y)/(x-y)
根号xy除以x-y分之根号x+根号y 即:根号xy/(根号x+根号y)/(x-y)
√(xy)÷[(√x+√y)/(x-y)]
=√(xy)×[(x-y))/(√x+√y)]
=√(xy)×[(√x+√y)(√x-√y)/(√x+√y)]
=√(xy)×(√x-√y)
=x√y-y√x
x倍的根号y-y倍的根号x