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己知x^2十y^2一6x十10y十34=0,且x,y均实数,则xy=
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己知x^2十y^2一6x十10y十34=0,且x,y均实数,则xy=
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x²十y²一6x十10y十34=0
x²一6x十9十y²十10y十25=0
(x一3)²十(y十5)²=0
x一3=0,y十5=0
x=3、y=-5
xy=3×(-5)=-15
x²一6x十9十y²十10y十25=0
(x一3)²十(y十5)²=0
x一3=0,y十5=0
x=3、y=-5
xy=3×(-5)=-15
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