3-x/x-2除以(x+2-5/x-2)

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3-x/x-2除以(x+2-5/x-2)3-x/x-2除以(x+2-5/x-2)3-x/x-2除以(x+2-5/x-2)原式=(3-x)/(x-2)÷[(x+2)(x-2)-5]/(x-2)=-(x-

3-x/x-2除以(x+2-5/x-2)
3-x/x-2除以(x+2-5/x-2)

3-x/x-2除以(x+2-5/x-2)
原式=(3-x)/(x-2)÷[(x+2)(x-2)-5]/(x-2)
=-(x-3)/(x-2)*(x-2)/(x²-9)
=-(x-3)/(x-2)*(x-2)/(x+3)(x-3)
=-1/(x+3)