(X-Y/X+2Y)÷[(X²-Y²/X²+4XY+4Y²)-2]其中x=2+根

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/05/24 05:50:29

(X-Y/X+2Y)÷[(X²-Y²/X²+4XY+4Y²)-2]其中x=2+根号3,y=2-根号3.
X-Y/X+2Y÷X²-Y²/X²+4XY+4Y²-2 其中x=2+根号3，y=2-根号3.上面的不算

X-Y/X+2Y÷X²-Y²/X²+4XY+4Y²-2
=(X-Y/X+2Y)*(X+2y)^2/(x+y)(x-y)-2
=x+2y/x+y-2
=x+2y-2x-2y/x+y
=-x/x+y
=-(2+√3)/(2+√3+2-√3 )
=-(2+√3)/4

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