已知x+y=5,xy=-6,求3x^2+3y^2
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已知x+y=5,xy=-6,求3x^2+3y^2
已知x+y=5,xy=-6,求3x^2+3y^2
已知x+y=5,xy=-6,求3x^2+3y^2
解3x^2+3y^2
=3(x^2+y^2)
=3(x^2+y^2+2xy-2xy)
=3[(x+y)^2-2xy]
=3[(5)^2-2×(-6)]
=3×(25+12)
=3×37
=111.
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