已知:(x+y)(x+y+6)+9=0 求2(x+y)的值
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已知:(x+y)(x+y+6)+9=0 求2(x+y)的值
![已知:(x+y)(x+y+6)+9=0 求2(x+y)的值](/uploads/image/z/19712089-1-9.jpg?t=%E5%B7%B2%E7%9F%A5%3A%28x%2By%29%28x%2By%2B6%29%2B9%3D0+%E6%B1%822%28x%2By%29%E7%9A%84%E5%80%BC)
(x+y)(x+y+6)+9=0
即(x+y)(x+y)+(x+y)*6+9=0
(x+y+3)方=0
x+y+3=0 x+y=-3
2(x+y)=-6
即(x+y)(x+y)+(x+y)*6+9=0
(x+y+3)方=0
x+y+3=0 x+y=-3
2(x+y)=-6
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