先化简,再求值:括号x+2分之x
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先化简,再求值:括号x+2分之x²-5x+2+1括号除以x²+4x+4分之x²-4.其中x=2+根号3
括号x+2分之x²-5x+2+1括号除以x²+4x+4分之x²-4
原式=[(x²-5x+2)/(x+2)+1]÷[(x²-4)/(x²+4x+4)]
=[(x²-5x+2+x+2)/(x+2)]÷[(x+2)(x-2)/(x+2)²]
=[(x²-4x+4)/(x+2)]÷[(x-2)/(x+2)]
=[(x-2)²/(x+2)]×[(x+2)/(x-2)]
=x-2
=2+√3-2
=√3
括号x+2分之x²-5x+2+1括号除以x²+4x+4分之x²-4
原式=[(x²-5x+2)/(x+2)+1]÷[(x²-4)/(x²+4x+4)]
=[(x²-5x+2+x+2)/(x+2)]÷[(x+2)(x-2)/(x+2)²]
=[(x²-4x+4)/(x+2)]÷[(x-2)/(x+2)]
=[(x-2)²/(x+2)]×[(x+2)/(x-2)]
=x-2
=2+√3-2
=√3
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