先化简,再求值:[-xy/(x-y)^2]^4*(x^2-xy/x)3*x^4/y^10÷(x/xy-y^2)^5先化简,再求值:[-(xy)/(x-y)^2]^4*(x^2-xy/x)3*x^4/y^10÷(x/xy-y^2)^5,其中x=-2,y=4.
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![先化简,再求值:[-xy/(x-y)^2]^4*(x^2-xy/x)3*x^4/y^10÷(x/xy-y^2)^5先化简,再求值:[-(xy)/(x-y)^2]^4*(x^2-xy/x)3*x^4/y^10÷(x/xy-y^2)^5,其中x=-2,y=4.](/uploads/image/z/1101694-22-4.jpg?t=%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC%EF%BC%9A%5B-xy%2F%28x-y%29%5E2%5D%5E4%2A%28x%5E2-xy%2Fx%293%2Ax%5E4%2Fy%5E10%C3%B7%28x%2Fxy-y%5E2%29%5E5%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC%EF%BC%9A%5B-%28xy%29%2F%28x-y%29%5E2%5D%5E4%2A%28x%5E2-xy%2Fx%293%2Ax%5E4%2Fy%5E10%C3%B7%28x%2Fxy-y%5E2%29%5E5%2C%E5%85%B6%E4%B8%ADx%3D-2%2Cy%3D4.)
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先化简,再求值:[-xy/(x-y)^2]^4*(x^2-xy/x)3*x^4/y^10÷(x/xy-y^2)^5先化简,再求值:[-(xy)/(x-y)^2]^4*(x^2-xy/x)3*x^4/y^10÷(x/xy-y^2)^5,其中x=-2,y=4.
先化简,再求值:[-xy/(x-y)^2]^4*(x^2-xy/x)3*x^4/y^10÷(x/xy-y^2)^5
先化简,再求值:[-(xy)/(x-y)^2]^4*(x^2-xy/x)3*x^4/y^10÷(x/xy-y^2)^5,其中x=-2,y=4.
先化简,再求值:[-xy/(x-y)^2]^4*(x^2-xy/x)3*x^4/y^10÷(x/xy-y^2)^5先化简,再求值:[-(xy)/(x-y)^2]^4*(x^2-xy/x)3*x^4/y^10÷(x/xy-y^2)^5,其中x=-2,y=4.
[-(xy)/(x-y)^2]^4*[(x^2-xy)/x]^3*x^4/y^10÷[x/(xy-y^2)]^5
=(x^4y^4)/(x-y)^8*(x-y)^3*x^4/y^10*[y^5(x-y)^5]/x^5
=x^3/y
代入x=-2,y=4,
原式=(-2)^3/4=-2.
x(x-y)(X^2-xy-y^2)-x^2y(y-x)
=x(x-y)(x²-xy-y²)+x(x-y)xy
=x(x-y)(x²-xy-y²+xy)
=x(x-y)(x²-y²)
*(x^2-xy/x)这项写的对吗?x不消了吗?是不是少括号?
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