已知x+y=-2,xy=3,求2xy+x+y的值 1.已知x+y=-2,xy=3,求2xy+x+y的值2.已知2x²-5x+4=5,求式子(15x²-18x+4)-(-3x²+19-32)-8x的值3.已知A=-3X²-2mx+3x+1,B=2x²+2mx-1,且2A+3B的值与x无关,求m的值
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![已知x+y=-2,xy=3,求2xy+x+y的值 1.已知x+y=-2,xy=3,求2xy+x+y的值2.已知2x²-5x+4=5,求式子(15x²-18x+4)-(-3x²+19-32)-8x的值3.已知A=-3X²-2mx+3x+1,B=2x²+2mx-1,且2A+3B的值与x无关,求m的值](/uploads/image/z/5493953-65-3.jpg?t=%E5%B7%B2%E7%9F%A5x%2By%3D-2%2Cxy%3D3%2C%E6%B1%822xy%2Bx%2By%E7%9A%84%E5%80%BC+1.%E5%B7%B2%E7%9F%A5x%2By%3D-2%2Cxy%3D3%2C%E6%B1%822xy%2Bx%2By%E7%9A%84%E5%80%BC2.%E5%B7%B2%E7%9F%A52x%26%23178%3B-5x%2B4%3D5%2C%E6%B1%82%E5%BC%8F%E5%AD%90%EF%BC%8815x%26%23178%3B-18x%2B4%EF%BC%89-%EF%BC%88-3x%26%23178%3B%2B19-32%EF%BC%89-8x%E7%9A%84%E5%80%BC3.%E5%B7%B2%E7%9F%A5A%3D-3X%26%23178%3B-2mx%2B3x%2B1%2CB%3D2x%26%23178%3B%2B2mx-1%2C%E4%B8%942A%2B3B%E7%9A%84%E5%80%BC%E4%B8%8Ex%E6%97%A0%E5%85%B3%2C%E6%B1%82m%E7%9A%84%E5%80%BC)
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