若(x²-4x+4)+(y²+6y+9)=0 求x²-6xy+9y²
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若(x²-4x+4)+(y²+6y+9)=0 求x²-6xy+9y²
![若(x²-4x+4)+(y²+6y+9)=0 求x²-6xy+9y²](/uploads/image/z/1524399-15-9.jpg?t=%E8%8B%A5%28x%26%23178%3B-4x%2B4%29%2B%28y%26%23178%3B%2B6y%2B9%29%3D0+%E6%B1%82x%26%23178%3B-6xy%2B9y%26%23178%3B)
X=2;y=-3 方程式=121
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