已知X的平方+Y的平方-2X-4Y+5=0,求分式X分之Y-Y分之X的值
人气：119 ℃ 时间：2019-10-19 16:21:52
解答
原式＝(x^2-2x+1)+(y^2-4y+4)=(x-1)^2+(y-2)^2=0,所以x=1,y=2,代入问题得结果为3/2
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