(x-y/x+2y)/(x^2-y^2/x^2+4xy+4y^2),其中x=1-根号2 y=根号2-2
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![(x-y/x+2y)/(x^2-y^2/x^2+4xy+4y^2),其中x=1-根号2 y=根号2-2](/uploads/image/z/13897445-5-5.jpg?t=%EF%BC%88x-y%2Fx%2B2y%29%2F%28x%5E2-y%5E2%2Fx%5E2%2B4xy%2B4y%5E2%29%2C%E5%85%B6%E4%B8%ADx%3D1-%E6%A0%B9%E5%8F%B72+y%3D%E6%A0%B9%E5%8F%B72-2)
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(x-y/x+2y)/(x^2-y^2/x^2+4xy+4y^2),其中x=1-根号2 y=根号2-2
(x-y/x+2y)/(x^2-y^2/x^2+4xy+4y^2),其中x=1-根号2 y=根号2-2
(x-y/x+2y)/(x^2-y^2/x^2+4xy+4y^2),其中x=1-根号2 y=根号2-2
先对式子化简 对分母x^2-y^2/x^2+4xy+4y^2=(x+2y)^2-y^2/x^2=(x+2y-y/x)(x+2y+y/x)
原式=(x-y/x+2y)/(x+2y-y/x)(x+2y+y/x)=1/(x+2y+y/x),再待数字计算
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