化简求值:(x^2-y^2)/x乘以2x/(x^2-2xy+y^2),其中x=2,y=1
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化简求值:(x^2-y^2)/x乘以2x/(x^2-2xy+y^2),其中x=2,y=1化简求值:(x^2-y^2)/x乘以2x/(x^2-2xy+y^2),其中x=2,y=1化简求值:(x^2-y^
化简求值:(x^2-y^2)/x乘以2x/(x^2-2xy+y^2),其中x=2,y=1
化简求值:(x^2-y^2)/x乘以2x/(x^2-2xy+y^2),其中x=2,y=1
化简求值:(x^2-y^2)/x乘以2x/(x^2-2xy+y^2),其中x=2,y=1
=(x+y)(x-y)/x×2x/(x-y)²
=(x+y)×2/(x-y)
=2(x+y)/(x-y)
=6
(X²-Y²/X)*(2X/X²-2XY+Y² ) X=2 Y=1
(4-1/2)*(1-4+1)=-14
原式=[(x+y)(x-y)/x][2x/(x-y)²]
=2x(x+y)(x-y)/[x(x-y)²]
=2(x+y)/(x-y)
=2×(2+1)/(2-1)
=6
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