计算:1-[8/(x^2-4)][(x^2+4)/4x]-1]/(1/2-1/x)
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计算:1-[8/(x^2-4)][(x^2+4)/4x]-1]/(1/2-1/x)计算:1-[8/(x^2-4)][(x^2+4)/4x]-1]/(1/2-1/x)计算:1-[8/(x^2-4)][(
计算:1-[8/(x^2-4)][(x^2+4)/4x]-1]/(1/2-1/x)
计算:1-[8/(x^2-4)][(x^2+4)/4x]-1]/(1/2-1/x)
计算:1-[8/(x^2-4)][(x^2+4)/4x]-1]/(1/2-1/x)
原式=1-[8/(x+2)(x-2)][(x²+4x+4)/4x]/[(x-2)/2x]
=1-[8/(x+2)(x-2)][(x+2)²/4x][2x/(x-2)]
=1-4(x+2)/(x-2)²
=(x²-4x+4-4x-8)/(x-2)²
=(x²-8x-4)/(x²-4x+4)
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