=(xy-1-1-xy)/3=-2/3
[x(x²y²-xy)-y(x²-x³y)]÷3x²y
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(x√x+x√y)÷(xy-y^2)--(x+√xy+y)÷(x√x-y√y)
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【x(x²y²-xy)-y(x²-x³y)】÷3x²y
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(x²y³+xy)(x²y³-xy)÷x²y³,其中x=3,
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(xy-x²)÷[(x²-2xy+y²)÷xy]*[(x-y)÷x²]
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已知x÷y=3,则x²+2xy-3y²÷(x²-xy+y²)=?