(x-y)/(√x+√y)=((√x)^2-(√y)^2))/(√x+√y)=(√x+√y)(√x-√y)/(√x+√y)=√x-√y
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(x-y)/(√x+√y)=((√x)^2-(√y)^2))/(√x+√y)=(√x+√y)(√x-√y)/(√x+√y)=√x-√y