先化简再求值(x²+xy-2y²)/(x²-2xy+y²)

来源:学生作业帮助网 编辑:作业帮 时间:2024/07/18 18:19:01
先化简再求值(x²+xy-2y²)/(x²-2xy+y²)
xN@_`0lg:SڎR6f:ҪJ1QFtaB,DwĝD| q+1HL='9޲Wyw܊N:è5KP@TPgnh4Z5vYg{،lo0=k7*h;6]_4Dp};7sh]N#B, CQUS SdY%@99ŌM"PP-@H[^b"eƢbÄ10W!dF- adʜ,W)/rR ځN(D}\? p|szx(z=t @q1~Jj!i<|=BQDCM;zOR

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