已知√x+y-3+绝对值xy+x+y-2l =0求x/y+y/x的值(初一)已知√x+y-3+绝对值xy+x+y-2l =0求x/y+y/x的值!

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已知√x+y-3+绝对值xy+x+y-2l =0求x/y+y/x的值(初一)已知√x+y-3+绝对值xy+x+y-2l =0求x/y+y/x的值!
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已知√x+y-3+绝对值xy+x+y-2l =0求x/y+y/x的值(初一)已知√x+y-3+绝对值xy+x+y-2l =0求x/y+y/x的值!
已知√x+y-3+绝对值xy+x+y-2l =0求x/y+y/x的值(初一)
已知√x+y-3+绝对值xy+x+y-2l =0求x/y+y/x的值!

已知√x+y-3+绝对值xy+x+y-2l =0求x/y+y/x的值(初一)已知√x+y-3+绝对值xy+x+y-2l =0求x/y+y/x的值!
x+y=3⑴
xy+x+y=2⑵
x/y+y/x=-(x的平方+y的平方)(⑵-⑴的xy=-1)
所以得x/y+y/x=-11

有题可得x+y-3=0,xy+x+y-2=0,所以x+y=3,xy=-1. x/y+y/x=[(x+y)的平方-2xy]/xy=-11