将Y=KX代入Y=2/X中,得
KX=2/X
X²=2/K
X=±√2/K
当X1=√2/K时,Y1=KX=√2K
当X2=-√2/K时,Y1=KX=-√2K
则X1Y2+X2Y1
=√2/K×(-√2K)+(-√2/K)×(√2K)
=-2-2
=-4
将Y=KX代入Y=2/X中,得
KX=2/X
X²=2/K
X=±√2/K
当X1=√2/K时,Y1=KX=√2K
当X2=-√2/K时,Y1=KX=-√2K
则X1Y2+X2Y1
=√2/K×(-√2K)+(-√2/K)×(√2K)
=-2-2
=-4