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If the square of x times the square of Y minus 2XY plus 1 equals 0, then the relationship between X and Y is zero——
Multiply the square of X by the square of Y minus 2XY plus 1 = 0
The square of (XY-1) = 0
xy-1=0
xy=1
So the relationship between X and Y is reciprocal
Known XY
（1） x=±1,y=±2
Another XY
It is known that LXL = 2, lyi = 5, XY
3
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