若x2+4x+y2-6y+13=0,则(x+2y)(x-2y)的值为----------
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![若x2+4x+y2-6y+13=0,则(x+2y)(x-2y)的值为----------](/uploads/image/z/2673846-54-6.jpg?t=%E8%8B%A5x2%2B4x%2By2-6y%2B13%3D0%2C%E5%88%99%28x%2B2y%29%28x-2y%29%E7%9A%84%E5%80%BC%E4%B8%BA----------)
若x2+4x+y2-6y+13=0,则(x+2y)(x-2y)的值为----------
若x2+4x+y2-6y+13=0,则(x+2y)(x-2y)的值为----------
若x2+4x+y2-6y+13=0,则(x+2y)(x-2y)的值为----------
x2+4x+y2-6y+13=0 (x+2)^2+(y-3)^2=0 x=-2 y=3 (x+2y)(x-2y) =x^2-4y^2 =4-36 =-32