已知2x+3y=5,xy=2,则4x^2+9y^2=

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已知2x+3y=5,xy=2,则4x^2+9y^2=已知2x+3y=5,xy=2,则4x^2+9y^2=已知2x+3y=5,xy=2,则4x^2+9y^2=2X+3Y=5\x05(2X+3Y)^2=5

已知2x+3y=5,xy=2,则4x^2+9y^2=
已知2x+3y=5,xy=2,则4x^2+9y^2=

已知2x+3y=5,xy=2,则4x^2+9y^2=
2X+3Y=5
\x05(2X+3Y)^2=5^2\x054X^2+9Y2=25-12XY 因为XY=2
\x05\x05所以,4X^2+9Y^2=1

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