x的平方-y的平方分之2xy + x+y分之x - y-x分之y
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（x的平方-y的平方)分之2xy + (x+y)分之x - (y-x)分之y
=（x的平方-y的平方)分之2xy + (x+y)分之x + (x-y)分之y
=(x²-y²)分之[2xy+x(x-y)+y(x+y)]
=(x²-y²)分之(2xy+x²-xy+yx+y²)
=(x²-y²)分之(2xy+x²+y²)
=[(x+y)(x-y)]分之(x+y)²
=(x-y)分之(x+y)
=（x的平方-y的平方)分之2xy + (x+y)分之x + (x-y)分之y
=(x²-y²)分之[2xy+x(x-y)+y(x+y)]
=(x²-y²)分之(2xy+x²-xy+yx+y²)
=(x²-y²)分之(2xy+x²+y²)
=[(x+y)(x-y)]分之(x+y)²
=(x-y)分之(x+y)
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