x+y=3,x05+y05-3xy=4 求xy

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x+y=3,x05+y05-3xy=4求xyx+y=3,x05+y05-3xy=4求xyx+y=3,x05+y05-3xy=4求xyx^2+y^2-3xy=4x^2+y^2+2xy-5xy=4(x+y

x+y=3,x05+y05-3xy=4 求xy
x+y=3,x05+y05-3xy=4 求xy

x+y=3,x05+y05-3xy=4 求xy
x^2+y^2-3xy=4
x^2+y^2+2xy-5xy=4
(x+y)^2-5xy=4
3^2-5xy=4
5xy=9-4
5xy=5
xy=1