2x的平方-4x分之x+2/(x-2+x-2分之8x其中x=√2-1)
1个回答
2016-04-21
展开全部
解:原式=[(x²-2x)/(x²-4)]÷[x-2-(2x-4)/(x+2)]={x(x-2)/[(x+2)(x-2)]÷[(x-2)(x+2)/(x+2)-2(x-2)/(x+2)]=[x/(x+2)]÷{[(x-2)(x+2)-2(x-2)]/(x+2)}=[x/(x+2)]÷[(x-2)(x+2-2)/(x+2)]=[x/(x+2)]÷[x(x-2)/(x+2)]=[x/(x+2)]×{(x+2)/[x(x-2)]}=1/(x-2)=1/(2+√2-2)=1/√2=(√2)/2
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