3-x/2x-4除以{(x+2)-(5/x-2)}

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3-x/2x-4除以{(x+2)-(5/x-2)}
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3-x/2x-4除以{(x+2)-(5/x-2)}
3-x/2x-4除以{(x+2)-(5/x-2)}

3-x/2x-4除以{(x+2)-(5/x-2)}
=(3-x/(2(x-2)))÷((x+2)*(x-2)/(x-2)-5/(x-2))
=(3-x/(2(x-2)))÷((x+2)*(x-2)-5/x-2))
=(3-x/(2(x-2)))*((x-2)/(x+2)*(x-2)-5)
=(3-x)/2*(1/x*x-9)
=-(x-3)/2*(1/(x+3)*(x-3))
=-1/2(x+3)

原式=[(3-x)/2(x-2)]÷{[(x-2)(x+2)-5]/(x-2)}
=[(3-x)/2(x-2)]÷[(x²-9)/(x-2)]
=[(3-x)/2(x-2)]÷[(x+3)(x-3)/(x-2)]
=-(x-3)(x-2)/[2(x-2)(x+3)(x-3)]
=-1/[2(x+3)]
=-1/(2x+6)

[(3-x)/(2x-4)]/[(x+2)-(5/x-2)]么