(x-2/x+2)+(x^2-20/x^2-4)坐等，速度，化简

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(x-2/x+2)+(x^2-20/x^2-4)坐等，速度，化简

(x-2/x+2)+(x^2-20/x^2-4)坐等，速度，化简
(x-2/x+2)+(x^2-20/x^2-4)
坐等，速度，化简

(x-2/x+2)+(x^2-20/x^2-4)坐等，速度，化简
(x-2/x+2)+(x^2-20/x^2-4)
=(x-2)²/(x+2)(x-2)+(x²-20)/(x+2)(x-2)
=(x²-4x+4+x²-20)/(x+2)(x-2)
=(2x²-4x-16)/(x+2)(x-2)
=2(x²-2x-8)/(x+2)(x-2)
=2(x-4)(x+2)/(x+2)(x-2)
=2(x-4)/(x-2)

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