化简（x平方-4反之X平方-4X+4+2-X分之X+2）/X分之X-2
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（一）
{ (x^2-4x+4)/(x^2-4) + (x+2)/(2-x) } ÷ (x-2)/x
= { (x-2)^2/[(x+2)(x-2)] - (x+2)/(x-2) } * x/ (x-2)
= { (x-2)/(x+2) - (x+2)/(x-2) } * x/ (x-2)
= { [ (x-2)^2 - (x+2)^2 ] / [ (x+2)(x-2) ] } * x/ (x-2)
= {-4x / [ (x+2)(x-2) ] } * x/ (x-2)
= -4x^2 / [ (x+2)(x-2)^2 ]
（二）
{ (x^2-4x+4)/(x^2-4) + (x+2)/(2-x) } * (x-2)/x
= { (x-2)^2/[(x+2)(x-2)] - (x+2)/(x-2) } * (x-2)/x
= { (x-2)/(x+2) - (x+2)/(x-2) } * x/ (x-2)
= { [ (x-2)^2 - (x+2)^2 ] / [ (x+2)(x-2) ] } * (x-2)/x
= {-4x / [ (x+2)(x-2) ] } * (x-2)/x
= - 4 / (x+2)
{ (x^2-4x+4)/(x^2-4) + (x+2)/(2-x) } ÷ (x-2)/x
= { (x-2)^2/[(x+2)(x-2)] - (x+2)/(x-2) } * x/ (x-2)
= { (x-2)/(x+2) - (x+2)/(x-2) } * x/ (x-2)
= { [ (x-2)^2 - (x+2)^2 ] / [ (x+2)(x-2) ] } * x/ (x-2)
= {-4x / [ (x+2)(x-2) ] } * x/ (x-2)
= -4x^2 / [ (x+2)(x-2)^2 ]
（二）
{ (x^2-4x+4)/(x^2-4) + (x+2)/(2-x) } * (x-2)/x
= { (x-2)^2/[(x+2)(x-2)] - (x+2)/(x-2) } * (x-2)/x
= { (x-2)/(x+2) - (x+2)/(x-2) } * x/ (x-2)
= { [ (x-2)^2 - (x+2)^2 ] / [ (x+2)(x-2) ] } * (x-2)/x
= {-4x / [ (x+2)(x-2) ] } * (x-2)/x
= - 4 / (x+2)
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