若x=2^2009,y=(-2)^2009.则4x^2-8xy+4y^2=
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x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
若f(x+y,y/x)=x^2-y^2,则F(X,Y)=
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
若x*x+y*y=x+y-1/2,求x,y的值如题
若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值
若2x=3y,则(x*x+y*y)/x*x=?
已知x=3分之一,y=-2分之一,求代数式x-(x+y)+(x+2Y)-(x+3y)+(x+4y)...-(x+2009y)
若集合A={(x,y)|y>=|x-2|} ,B={(x,y)|y
化简(x^2-y^2)/(x+y)解法一:(x^2-y^2)/(x+y)=(x+y)(x-y)/(x+y)=x-y解法二:(x^2-y^2)/(x+y)=(x^2-y^2)(x-y)/(x+y)(x-y)=(x^2-y^2)(x-y)/(x^2-y^2)=x-y你认为小红同学的两种解法对吗?若解法错误,请说明原因
填空:x-y/x+y=( )/x^2-y^2
先化简,再求值 (1)[(x-y)的平方+(x+y)(x-y)]÷2x 其中X=2010,y=2009 (2)y(x+y)+(x+y)(x-y)-x的平方,先化简,再求值(1)[(x-y)的平方+(x+y)(x-y)]÷2x 其中X=2010,y=2009(2)y(x+y)+(x+y)(x-y)-x的平方,其中x=-2,y=二分
(x-y)2•(y-x)³(x-y)=?
若变量x,y满足约束条件{x>=-1;y>=x;3x+2y
若x,y,z成等差数列,则(z-x)^2-4(x-y)(y-x)=
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
y+y'-2y=2x
若|x+y-1|+(x-y-2)²=0,求代数式(x+2y)(x-2y)-(2x-y)(-y-2x)的值.