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原式 = x^4y (x^2+y^2)/{(x^2+y^2)(y^2 - x^2)x^2) - y^2x/{(x+y)(y-x)}
= x^2y/(y^2-x^2) - y^2x/(y^2-x^2)
= xy(x - y)/{(y-x)(x+y)}
= -xy/(x+y) = -2/3
= x^2y/(y^2-x^2) - y^2x/(y^2-x^2)
= xy(x - y)/{(y-x)(x+y)}
= -xy/(x+y) = -2/3
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