25(x+y)^2+16(x-y)^2=

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25(x+y)^2+16(x-y)^2=
4y(y-x)^2-6y(x-y)^3=
(a-2b)^2+(a-2b)+1/4=

1
25(x+y)^2+16(x-y)^2
=25(x^+2xy+y^)+16(x^-2xy+y^)
=25x^+50xy+25y^+16x^-32xy+16y^
=41x^+18xy+41y^
2
4y(y-x)^2-6y(x-y)^3
=4y(y^-2xy+x^)-6y(x^3-3x^y+3xy^-y^3)
=4y^3-8xy^+4x^y-6x^3y+18x^y^-18xy^3+6y^4
3
(a-2b)^2+(a-2b)+1/4
=a^-4ab+4b^+a-2b+1/4

[x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013 已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) (x+y)^2-16(x-y)^2 y'-2y=(e^x)-x y'+2y/x=x通解 x,y属于R*,且x+y=1,求证:(1)(x+1/x)(y+1/y)≥25/4 (2)(x+1/x)^2+(y+1/y 1、x(x-y)(x+y)-x(x+y)^2 已知x.x+y.y+8x+6y+25=0,求代数式(x.x-4y.y)/(x.x+4xy+4y.y)-x/(x+2y)的 1) (2x+5y)(2x-5y)(-4x^2-25y^2) 2) [（x+y)(x-y)-(x-y)^2+2y(x-y 【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2= 数学题已知p=x^/x-y-y^/x-y,q=(x+y)^-2Y(X+Y),