设实数X,Y满足X^2+2XY-1=0,则XY的取值范围是?这个是对的

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设实数X,Y满足X^2+2XY-1=0,则XY的取值范围是?这个是对的设实数X,Y满足X^2+2XY-1=0,则XY的取值范围是?这个是对的设实数X,Y满足X^2+2XY-1=0,则XY的取值范围是?

设实数X,Y满足X^2+2XY-1=0,则XY的取值范围是?这个是对的
设实数X,Y满足X^2+2XY-1=0,则XY的取值范围是?这个是对的

设实数X,Y满足X^2+2XY-1=0,则XY的取值范围是?这个是对的
由题得xy=(1-x2)/2,
因为x2>=0,
所以xy=(1-x2)/2

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