1.xy=6,x²+y²=12,x与y相等吗?2.x+y=6,xy=z²+9,求x,y,z的值.3.若a-b=8,ab+c²+16=0,求证a+b+c=0.4.若x²+2x+y²-8y+17=0,求x,y的值.
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![1.xy=6,x²+y²=12,x与y相等吗?2.x+y=6,xy=z²+9,求x,y,z的值.3.若a-b=8,ab+c²+16=0,求证a+b+c=0.4.若x²+2x+y²-8y+17=0,求x,y的值.](/uploads/image/z/1094850-18-0.jpg?t=1.xy%3D6%2Cx%26%23178%3B%2By%26%23178%3B%3D12%2Cx%E4%B8%8Ey%E7%9B%B8%E7%AD%89%E5%90%97%3F2.x%2By%3D6%2Cxy%3Dz%26%23178%3B%2B9%2C%E6%B1%82x%2Cy%2Cz%E7%9A%84%E5%80%BC.3.%E8%8B%A5a-b%3D8%2Cab%2Bc%26%23178%3B%2B16%3D0%2C%E6%B1%82%E8%AF%81a%2Bb%2Bc%3D0.4.%E8%8B%A5x%26%23178%3B%2B2x%2By%26%23178%3B-8y%2B17%3D0%2C%E6%B1%82x%2Cy%E7%9A%84%E5%80%BC.)
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