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这道题这么做 20
2个回答
展开全部
(x+2)/(x^2-4)- (x^2-2x)/(x^2-4x+4)
=(x+2)/[(x-2)(x+2)] - x(x-2)/(x-2)^2
=1/(x-2) - x/(x-2)
=(1-x)/(x-2)
=(x+2)/[(x-2)(x+2)] - x(x-2)/(x-2)^2
=1/(x-2) - x/(x-2)
=(1-x)/(x-2)
追问
能在纸上写一遍吗
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