当x=2000,y=-10时计算x^2-2xy+y^2分之x^4-Y^4乘x^2+y^2分之y-x
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当x=2000,y=-10时计算x^2-2xy+y^2分之x^4-Y^4乘x^2+y^2分之y-x
当x=2000,y=-10时计算x^2-2xy+y^2分之x^4-Y^4乘x^2+y^2分之y-x=
当x=2000,y=-10时计算x^2-2xy+y^2分之x^4-Y^4乘x^2+y^2分之y-x=
[(x^4-y^4)/(x^2-2xy+y^2)] * (y-x)/(x^2+y^2)
=[(x-y)(x+y)(x^2+y^2)/(x-y)^2] * (y-x)/(x^2+y^2)
=[(x^2+y^2)(x+y)/(x-y)] * (y-x)/(x^2+y^2)
=-x-y
=-2000+10
=-1990
=[(x-y)(x+y)(x^2+y^2)/(x-y)^2] * (y-x)/(x^2+y^2)
=[(x^2+y^2)(x+y)/(x-y)] * (y-x)/(x^2+y^2)
=-x-y
=-2000+10
=-1990
当x=2000,y=-10时计算x^2-2xy+y^2分之x^4-Y^4乘x^2+y^2分之y-x
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