公式法的:1.把一元二次方程(x-2)(x+3)=5化成一般形式为__________2.已知一元二次方程2x²-3x-4=0,a=____,b=_____,c=_____,b²-4ac=______3.用配方法解一元二次方程x²-2x-3=0,配方后的方程为_____4.
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![公式法的:1.把一元二次方程(x-2)(x+3)=5化成一般形式为__________2.已知一元二次方程2x²-3x-4=0,a=____,b=_____,c=_____,b²-4ac=______3.用配方法解一元二次方程x²-2x-3=0,配方后的方程为_____4.](/uploads/image/z/1146889-1-9.jpg?t=%E5%85%AC%E5%BC%8F%E6%B3%95%E7%9A%84%EF%BC%9A1.%E6%8A%8A%E4%B8%80%E5%85%83%E4%BA%8C%E6%AC%A1%E6%96%B9%E7%A8%8B%EF%BC%88x-2%EF%BC%89%EF%BC%88x%2B3%EF%BC%89%3D5%E5%8C%96%E6%88%90%E4%B8%80%E8%88%AC%E5%BD%A2%E5%BC%8F%E4%B8%BA__________2.%E5%B7%B2%E7%9F%A5%E4%B8%80%E5%85%83%E4%BA%8C%E6%AC%A1%E6%96%B9%E7%A8%8B2x%26sup2%3B-3x-4%3D0%2Ca%3D____%2Cb%3D_____%2Cc%3D_____%2Cb%26sup2%3B-4ac%3D______3.%E7%94%A8%E9%85%8D%E6%96%B9%E6%B3%95%E8%A7%A3%E4%B8%80%E5%85%83%E4%BA%8C%E6%AC%A1%E6%96%B9%E7%A8%8Bx%26sup2%3B-2x-3%3D0%2C%E9%85%8D%E6%96%B9%E5%90%8E%E7%9A%84%E6%96%B9%E7%A8%8B%E4%B8%BA_____4.)
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