1.实数a,b,c满足(a+c)(a+b+c)<0,求证:(b-c)²>4a(a+b+c)2.已知抛物线y=ax²+bx+c的顶点坐标是(2,4),(1)若直线y=kx+4(k≠0)与y轴及该抛物线的交点依次为D,E,F,且S△ODE:S△OEF=1:3,其中O为坐标原点,用含a的
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![1.实数a,b,c满足(a+c)(a+b+c)<0,求证:(b-c)²>4a(a+b+c)2.已知抛物线y=ax²+bx+c的顶点坐标是(2,4),(1)若直线y=kx+4(k≠0)与y轴及该抛物线的交点依次为D,E,F,且S△ODE:S△OEF=1:3,其中O为坐标原点,用含a的](/uploads/image/z/2804865-33-5.jpg?t=1.%E5%AE%9E%E6%95%B0a%2Cb%2Cc%E6%BB%A1%E8%B6%B3%28a%2Bc%29%28a%2Bb%2Bc%29%EF%BC%9C0%2C%E6%B1%82%E8%AF%81%3A%28b-c%29%26sup2%3B%EF%BC%9E4a%28a%2Bb%2Bc%292.%E5%B7%B2%E7%9F%A5%E6%8A%9B%E7%89%A9%E7%BA%BFy%3Dax%26sup2%3B%2Bbx%2Bc%E7%9A%84%E9%A1%B6%E7%82%B9%E5%9D%90%E6%A0%87%E6%98%AF%282%2C4%29%2C%281%29%E8%8B%A5%E7%9B%B4%E7%BA%BFy%3Dkx%2B4%28k%E2%89%A00%29%E4%B8%8Ey%E8%BD%B4%E5%8F%8A%E8%AF%A5%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84%E4%BA%A4%E7%82%B9%E4%BE%9D%E6%AC%A1%E4%B8%BAD%2CE%2CF%2C%E4%B8%94S%E2%96%B3ODE%3AS%E2%96%B3OEF%3D1%3A3%2C%E5%85%B6%E4%B8%ADO%E4%B8%BA%E5%9D%90%E6%A0%87%E5%8E%9F%E7%82%B9%2C%E7%94%A8%E5%90%ABa%E7%9A%84)
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1.实数a,b,c满足(a+c)(a+b+c)<0,求证:(b-c)²>4a(a+b+c)2.已知抛物线y=ax²+bx+c的顶点坐标是(2,4),(1)若直线y=kx+4(k≠0)与y轴及该抛物线的交点依次为D,E,F,且S△ODE:S△OEF=1:3,其中O为坐标原点,用含a的
1.实数a,b,c满足(a+c)(a+b+c)<0,求证:(b-c)²>4a(a+b+c)
2.已知抛物线y=ax²+bx+c的顶点坐标是(2,4),(1)若直线y=kx+4(k≠0)与y轴及该抛物线的交点依次为D,E,F,且S△ODE:S△OEF=1:3,其中O为坐标原点,用含a的代数式表示k (2)若线段EF的长满足3根号2≤m≤3根号5,确定a的取值范围
这个,第二题能不能不下载啊
1.实数a,b,c满足(a+c)(a+b+c)<0,求证:(b-c)²>4a(a+b+c)2.已知抛物线y=ax²+bx+c的顶点坐标是(2,4),(1)若直线y=kx+4(k≠0)与y轴及该抛物线的交点依次为D,E,F,且S△ODE:S△OEF=1:3,其中O为坐标原点,用含a的
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