根號(hào)和絕對(duì)值大于等于0
相加為0則都等于0
所以x+y-3=0
xy+x+y-2=0
所以
x+y=3
xy=2-(x+y)=-1
所以(x+y)²=9
x²+y²+2xy=9
x²+y²=9-2xy=5
(x²+y²)/xy=-5
所以x/y+y/x=-5
已知x+y-3+lxy+x+y-2l=0求x/y+y/x的值
已知x+y-3+lxy+x+y-2l=0求x/y+y/x的值
已知√x+y-3+絕對(duì)值xy+x+y-2l =0求x/y+y/x的值
已知√x+y-3+絕對(duì)值xy+x+y-2l =0求x/y+y/x的值
數(shù)學(xué)人氣：265 ℃時(shí)間：2020-02-29 19:36:11
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