因式分解:4x^2-6x x(x-2)-3(x-2)若x+y=2,x^2+y^2=15,求xy的值
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![因式分解:4x^2-6x x(x-2)-3(x-2)若x+y=2,x^2+y^2=15,求xy的值](/uploads/image/z/2549352-48-2.jpg?t=%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%EF%BC%9A4x%5E2-6x+x%28x-2%29-3%28x-2%29%E8%8B%A5x%2By%3D2%2Cx%5E2%2By%5E2%3D15%2C%E6%B1%82xy%E7%9A%84%E5%80%BC)
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因式分解:4x^2-6x x(x-2)-3(x-2)若x+y=2,x^2+y^2=15,求xy的值
因式分解:4x^2-6x x(x-2)-3(x-2)
若x+y=2,x^2+y^2=15,求xy的值
因式分解:4x^2-6x x(x-2)-3(x-2)若x+y=2,x^2+y^2=15,求xy的值
4x^2-6x=2x(2x-3)
x(x-2)-3(x-2)=(x-2)(x-3)
x+y=2
平方得 x²+2xy+y²=4
∵x^2+y^2=15
∴2xy=4-15
xy=-5.5