若 x+y=8,x^2y^2=4,则x^2+y^2=
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若 x+y=8,x^2y^2=4,则x^2+y^2=
若 x+y=8,x^2y^2=4,则x^2+y^2=
若 x+y=8,x^2y^2=4,则x^2+y^2=
若 x+y=8,x^2y^2=4
则,xy=2,(-2)
1当xy=2时
x^2+y^2
=(x+y)^2-2xy
=8^2-2*2
=64-4
=60
2.当xy=-2时
x^2+y^2
=(x+y)^2-2xy
=8^2-2*(-2)
=64+4
=68
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