化簡[(x的平方-4)/(x的平方-4X+4)+(2-X)/(X+2)]÷x/(x-2) 的結果是?

題目:

化簡[(x的平方-4)/(x的平方-4X+4)+(2-X)/(X+2)]÷x/(x-2) 的結果是?

解答:

[(x的平方-4)/(x的平方-4X+4)+(2-X)/(X+2)]÷x/(x-2)
= [(x+2)(x-2)/(x-2)^2 -(x-2)/(x+2)] × (x-2)/x
= [(x+2)/(x-2) -(x-2)/(x+2)] × (x-2)/x
= [(x+2)^2 -(x-2)^2] / [(x+2)(x-2)] × (x-2)/x
= 8x / [(x+2)(x-2) × (x-2)/x
= 8 / (x+2)

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