化简求值:[3x/(x-1)-2x/(x+1)*(x2-1)/x 其中x=根号5 -5

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化简求值:[3x/(x-1)-2x/(x+1)*(x2-1)/x 其中x=根号5 -5

化简求值:[3x/(x-1)-2x/(x+1)*(x2-1)/x 其中x=根号5 -5
化简求值:[3x/(x-1)-2x/(x+1)*(x2-1)/x 其中x=根号5 -5

化简求值:[3x/(x-1)-2x/(x+1)*(x2-1)/x 其中x=根号5 -5
原式=[3x/(x-1)-2x/(x+1)]*(x+1)(x-1)/x
=3x/(x-1)*(x+1)(x-1)/x-2x/(x+1)*(x+1)(x-1)/x
=3(x+1)-2(x-1)
=3x+3-2x+2
=x+5
=√5-5+5
=√5