(2/(√x-√y)-2√x/（x√x+y√y）×（x-√xy+y)/(√x-√y))/4√xy 5
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(2/(√x-√y)-2√x/（x√x+y√y）×（x-√xy+y)/(√x-√y))/4√xy
=(2/(√x-√y)-2√x/√xy（√x+√y）×（x-√xy+y)/(√x-√y))/4√xy
=(2/(√x-√y)-2/√y（√x+√y）×（x-√xy+y)/(√x-√y))/4√xy
=(2√y（√x+√y）-2（√x+√y）×（x-√xy+y))/√y（√x+√y）(√x-√y))/4√xy
=2(√xy+y-x√x+x√y-y√x-x√y+y√x+y√y)/4y√x(x-y)
=(√xy+y-x√x+y√y)/2y√x(x-y)
=(√xy+y-x√x+y√y)/2y√x(x-y)
=(2/(√x-√y)-2√x/√xy（√x+√y）×（x-√xy+y)/(√x-√y))/4√xy
=(2/(√x-√y)-2/√y（√x+√y）×（x-√xy+y)/(√x-√y))/4√xy
=(2√y（√x+√y）-2（√x+√y）×（x-√xy+y))/√y（√x+√y）(√x-√y))/4√xy
=2(√xy+y-x√x+x√y-y√x-x√y+y√x+y√y)/4y√x(x-y)
=(√xy+y-x√x+y√y)/2y√x(x-y)
=(√xy+y-x√x+y√y)/2y√x(x-y)
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