1.求当m为何值时,抛物线y=x^2-(m+3)x+4的定点在坐标轴上?2.已知抛物线y=x^2+bx+c与y轴交与点A,与x轴的正半轴交与B,C两点,且BC=2,S ABC=3,求b的值.3.已知抛物线y=-x^2-(m-1)x+1/4m^2+1.(1)若对于任意两个正
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![1.求当m为何值时,抛物线y=x^2-(m+3)x+4的定点在坐标轴上?2.已知抛物线y=x^2+bx+c与y轴交与点A,与x轴的正半轴交与B,C两点,且BC=2,S ABC=3,求b的值.3.已知抛物线y=-x^2-(m-1)x+1/4m^2+1.(1)若对于任意两个正](/uploads/image/z/10392753-57-3.jpg?t=1.%E6%B1%82%E5%BD%93m%E4%B8%BA%E4%BD%95%E5%80%BC%E6%97%B6%2C%E6%8A%9B%E7%89%A9%E7%BA%BFy%3Dx%5E2-%28m%2B3%29x%2B4%E7%9A%84%E5%AE%9A%E7%82%B9%E5%9C%A8%E5%9D%90%E6%A0%87%E8%BD%B4%E4%B8%8A%3F2.%E5%B7%B2%E7%9F%A5%E6%8A%9B%E7%89%A9%E7%BA%BFy%3Dx%5E2%2Bbx%2Bc%E4%B8%8Ey%E8%BD%B4%E4%BA%A4%E4%B8%8E%E7%82%B9A%2C%E4%B8%8Ex%E8%BD%B4%E7%9A%84%E6%AD%A3%E5%8D%8A%E8%BD%B4%E4%BA%A4%E4%B8%8EB%2CC%E4%B8%A4%E7%82%B9%2C%E4%B8%94BC%3D2%2CS+ABC%3D3%2C%E6%B1%82b%E7%9A%84%E5%80%BC.3.%E5%B7%B2%E7%9F%A5%E6%8A%9B%E7%89%A9%E7%BA%BFy%3D-x%5E2-%28m-1%29x%2B1%2F4m%5E2%2B1.%EF%BC%881%EF%BC%89%E8%8B%A5%E5%AF%B9%E4%BA%8E%E4%BB%BB%E6%84%8F%E4%B8%A4%E4%B8%AA%E6%AD%A3)
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