x分之x^2-y^2除以x^2+xy分之x-y

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x分之x^2-y^2除以x^2+xy分之x-y

x分之x^2-y^2除以x^2+xy分之x-y
x分之x^2-y^2除以x^2+xy分之x-y

x分之x^2-y^2除以x^2+xy分之x-y
原式=(x²-y²)/x×(x²+xy)/(x-y)
=(x+y)(x-y)/x×x(x+y)/(x-y)
=(x+y)²

x分之x^2-y^2除以x^2+xy分之x-y
=x分之x^2-y^2乘以x-y分之x^2+xy
=(x+y)(x-y)(x)(x+y)/(x)(x-y)
=(x+y)²