(x+y)分之(x²-y²)×(x²+xy)分之(2x+2y)÷(x-y)
=(x+y)分之[(x+y)(x-y)]×[x(x+y)]分之[2(x+y)]×(x-y)分之1
=(x-y)×x分之2×(x-y)分之1
=x分之2

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