（x+y）^6/(x+y)^4-(x-y)^5/(x-y)^3 化简 ..
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（x+y）^6/(x+y)^4-(x-y)^5/(x-y)^3化简..（x+y）^6/(x+y)^4-(x-y)^5/(x-y)^3化简..（x+y）^6/(x+y)^4-(x-y)^5/(x-y)^
（x+y）^6/(x+y)^4-(x-y)^5/(x-y)^3 化简 ..
（x+y）^6/(x+y)^4-(x-y)^5/(x-y)^3 化简 ..
（x+y）^6/(x+y)^4-(x-y)^5/(x-y)^3 化简 ..
（x+y）^6/(x+y)^4-(x-y)^5/(x-y)^3
=（x+y）^(6-4)-(x-y)^(5-3)
=（x+y）^2-(x-y)^2
=(x+y+x-y)(x+y-x+y)
=(2x)(2y)
=4xy
（x+y）^6/(x+y)^4-(x-y)^5/(x-y)^3
=(x+y)^2-(x-y)^2
=[(x+y)+(x-y)][(x+y)-(x-y)]
=2x*2y
=4xy
（y-x）^4（x-y）^3+2（x-y）^6（y-x）
（x+y）^6/(x+y)^4-(x-y)^5/(x-y)^3 化简 ..
（x+y）/2- x-y/2=6 3(x+y)=4(x-y)
【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y)
1.（（y+2x)(-2x+y)+4(x+2y)^2)/3y 2.（2(x-y)^3-8(x-y）^2(x+y)+6y(x-y)^2）/2（x-y)^2
{(x,y) |x|+|y|
x>y?x:y
(x+y)(x-y)+4(y-1)
计算：（3x-4y）-[-（2y+x）+（x-3y）]-6x
（（x+2y)(x-2y)+4(x-y)的2次）/6x
已知x²+y²-8x+6y+25=0,求（x-y+4xy/x-y）（x+y-4xy/x+y）
｛（x²+y²）-（x-y）+2y（x-y）｝/4y
x(x-y)+4(y-x)因式分解
（y-x)+x(x-y)^3-(y-x)^4 因式分解
(x+4y-6)(x-4y+6)-(4y+x+6)(4y-x-6)
（x-y）³（y-x）（y-x）²+（x-y）^6
y'=（y/x）^2+y/x+4微分方程
(3x-4y)(5x-4y)-(7x-8y)(6y-5x)