x²+xy/(x-4y)(x+y),其中x=4,y=-1

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x²+xy/(x-4y)(x+y),其中x=4,y=-1
x²+xy/(x-4y)(x+y),其中x=4,y=-1

x²+xy/(x-4y)(x+y),其中x=4,y=-1
x²+xy/(x-4y)(x+y)
=x(x+y)/(x-4y)(x+y)
=x/(x-4y)
=4/(4+4)
=1/2