[(x-y)²+（x+y）(x-y)]/2xx=3,y=-1.5

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[(x-y)²+（x+y）(x-y)]/2xx=3,y=-1.5[(x-y)²+（x+y）(x-y)]/2xx=3,y=-1.5[(x-y)²+（x+y）(x-y)]/2

[(x-y)²+（x+y）(x-y)]/2xx=3,y=-1.5
[(x-y)²+（x+y）(x-y)]/2x
x=3,y=-1.5

[(x-y)²+（x+y）(x-y)]/2xx=3,y=-1.5
[(x-y)²+（x+y）(x-y)]/2x
=[(x^2-2xy+y^2+x^2-y^2]/2x
=x-y
=4.5