①已知x:y=-2:3,求[(x^2-y^2)/xy]^2[(x+y)*(x-y)/x^3]÷x/y^2
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①已知x:y=-2:3,求[(x^2-y^2)/xy]^2[(x+y)*(x-y)/x^3]÷x/y^2
②已知(a+b-c)/c=(a-b+c/b)=(-a+b+c)/a,求[(a+b)(b+c)(c+a)]/abc的值
②已知(a+b-c)/c=(a-b+c/b)=(-a+b+c)/a,求[(a+b)(b+c)(c+a)]/abc的值
![①已知x:y=-2:3,求[(x^2-y^2)/xy]^2[(x+y)*(x-y)/x^3]÷x/y^2](/uploads/image/z/3273456-48-6.jpg?t=%E2%91%A0%E5%B7%B2%E7%9F%A5x%3Ay%3D-2%3A3%2C%E6%B1%82%5B%28x%5E2-y%5E2%29%2Fxy%5D%5E2%5B%28x%2By%29%2A%28x-y%29%2Fx%5E3%5D%C3%B7x%2Fy%5E2)
1.[(x^2-y^2)/xy]^2[(x+y)*(x-y)/x^3]÷x/y^2
=(x/y-y/x)^2(y^2/x^2-y^4/x^4)
=(2/3-3/2)^2[(3/2)^2-(3/2)^4]
再问: 剩下一道呢
=(x/y-y/x)^2(y^2/x^2-y^4/x^4)
=(2/3-3/2)^2[(3/2)^2-(3/2)^4]
再问: 剩下一道呢
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