已知x=2分之1,y=3分之1
√x-√y分之√x-√x+√y分之√y
=[√x(√x+√y)-√y(√x-√y)]/(√x-√y)(√x+√y)
=(x+√xy-√xy+y)/(x-y)
=(x+y)/(x-y)
=(1/2+1/3)/(1/2-1/3)
=5/6/(1/6)
=5;
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