若,2011x^3+2012y^3+2013z^3的立方根=2011的立方根+2012的立方根+2013的立方根,2011x^3=2012y^3=2013z^3,xyz>0,求1/x+1/y+1/z的值.(提示:设2011x^3=2012y^3=2013z^3=m,则,2011x^2=m/x,2011的立方根=m的立方根/x,同理可得2012
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化简(2x^3y^3+x^4y^2+x^2y^4)^2-x^2y^2(x+y)^2,x=2012,y=-2011
若2x+y=2012,则代数式2(3x-2y)-(x-y)+(-x+9y)=
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x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
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(3x-y)(3y+x)-(x-y)(x+y)
若|x-3|=2,|y+1|=2,|x|大于|y|,xy小于0,且求(x+2y)的2012次方+(x+2y)的2011次方+...+(x+2y)的2次
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先化简,再求值.2x(x+y)-(x+y)^2,其中x=根号2012,y=根号2011(2)a^2(x-y)-2a(x-y)^2+(x-y)^3
若3x=5y,则x:y=________,(x-y):y=______
x(x-y)2-(y-x)3
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若3x=7y,则y比x= ,x:(x+y)=