先化简,再求值:[x+2-(x-2分之5)]除以(x-2分之x-3),其中x=-2

问题描述:

先化简,再求值:[x+2-(x-2分之5)]除以(x-2分之x-3),其中x=-2

原式=[(x+2)(x-2)-5]/(x-2)]×(x-2)/(x-3)
=(x²-9)/(x-2)×(x-2)/(x-3)
=(x+3)(x-3)/(x-2)×(x-2)/(x-3)
=x+3
=-2+3
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