问题
填空题
已知x+y=6,xy=-2,则
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答案
+1 x2
=1 y2
=x2+y2 x2y2
,(x+y)2-2xy (xy)2
∵x+y=6,xy=-2,
∴原式=
=62-2×(-2) (-2)2
=10.36+4 4
已知x+y=6,xy=-2,则
|
+1 x2
=1 y2
=x2+y2 x2y2
,(x+y)2-2xy (xy)2
∵x+y=6,xy=-2,
∴原式=
=62-2×(-2) (-2)2
=10.36+4 4