先化简再求值(x²+xy-2y²)/(x²-2xy+y²)
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先化简再求值(x²+xy-2y²)/(x²-2xy+y²)
先化简再求值(x²+xy-2y²)/(x²-2xy+y²)
先化简再求值(x²+xy-2y²)/(x²-2xy+y²)
原式=(x-y)(x+2y)除以(x-y)(x-y)-(1-x方y的四次方)-x方y的四次方
=(x+2y)除以(x-y)-1
当x=根3+根2,y=根3-根2
上式=(3倍根3-根2)除以(2倍根2)-1