化简求值:{(x-y)^2-x(3x-2y)+(x+y)(x-y)}÷2x,x=1,y=-2
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[(x-y)^2-x(3x-2y)+(x+y)(x-y)]÷2x
=(x^2-2xy+y^2-3x^2+2xy+x^2-y^2)÷2x
=(x^2-3x^2+x^2-2xy+2xy+y^2-y^2)÷2x
=-x^2÷2x
=-x/2
=-1/2
=(x^2-2xy+y^2-3x^2+2xy+x^2-y^2)÷2x
=(x^2-3x^2+x^2-2xy+2xy+y^2-y^2)÷2x
=-x^2÷2x
=-x/2
=-1/2
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