化简 x+y-x-y分之2x²

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化简 x+y-x-y分之2x²
化简 x+y-x-y分之2x²

化简 x+y-x-y分之2x²
x+y-(x-y)分之(2x²)
=(x-y)分之[(x+y)(x-y)]-(x-y)分之(2x²)
=(x-y)分之[(x+y)(x-y)-2x²]
=(x-y)分之(x²-y²-2x²)
=(x-y)分之(-x²-y²)
=(y-x)分之(x²+y²)