(x^2-8x+16)/(4-x^2)/(16-x^2)/(4+4x+x^2)
问题描述：
(x^2-8x+16)/(4-x^2)/(16-x^2)/(4+4x+x^2)
答
(x^2-8x+16)/(4-x^2)/(16-x^2)/(4+4x+x^2)
=[(x-4)^2/(4-x^2)]*[(x+2)^2/(16-x^2)]
=(4-x)(2+x)/[(2-x)(4+x)]
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