1.计算x/(2-x)-(4-x^2)/(x^2+4x+4 )

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1.计算x/(2-x)-(4-x^2)/(x^2+4x+4)1.计算x/(2-x)-(4-x^2)/(x^2+4x+4)1.计算x/(2-x)-(4-x^2)/(x^2+4x+4)x/(2-x)-(4

1.计算x/(2-x)-(4-x^2)/(x^2+4x+4 )
1.计算x/(2-x)-(4-x^2)/(x^2+4x+4 )

1.计算x/(2-x)-(4-x^2)/(x^2+4x+4 )
x/(2-x)-(4-x^2)/(x^2+4x+4 )
=x/(2-x)+(x+2)(x-2)/[(x+2)²]
=x/(x-2)+(x-2)/(x+2)
=[x(x+2)+x(x-2)]/[(x-2)(x+2)]
=2x²/(x²-4)