﹙x√x﹢x√y/xy﹣y²﹚﹣﹙x﹢√xy﹢y/x√x﹣y√y﹚=?
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﹙x√x﹢x√y/xy﹣y²﹚﹣﹙x﹢√xy﹢y/x√x﹣y√y﹚
=x(√x﹢√y)/y(√x﹢√y)(√x-√y)-﹙x﹢√xy﹢y)/(√x)^3﹣(√y﹚^3
=x/y(√x-√y)-﹙x﹢√xy﹢y)/(√x﹣√y﹚﹙x﹢√xy﹢y)
=x/y(√x-√y)-1/(√x﹣√y﹚
=x/y(√x-√y)-y/y(√x﹣√y﹚
=(x-y)/y(√x﹣√y﹚
=(√x+√y)(√x-√y)/y(√x﹣√y﹚
==(√x+√y)/y
=x(√x﹢√y)/y(√x﹢√y)(√x-√y)-﹙x﹢√xy﹢y)/(√x)^3﹣(√y﹚^3
=x/y(√x-√y)-﹙x﹢√xy﹢y)/(√x﹣√y﹚﹙x﹢√xy﹢y)
=x/y(√x-√y)-1/(√x﹣√y﹚
=x/y(√x-√y)-y/y(√x﹣√y﹚
=(x-y)/y(√x﹣√y﹚
=(√x+√y)(√x-√y)/y(√x﹣√y﹚
==(√x+√y)/y
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