二次函数y=ax²+bx+c(a≠0)的图象如图所示,①b²-4ac>0② 2a+b<0 ③4a-二次函数y=ax²+bx+c(a≠0)的图象如图所示,①b²-4ac>0② 2a+b<0 ③4a-2b+c=0 ④a:b:c=-1:2:3,其中正确的是 A.①② B.②③ C.
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/07 16:12:28
![二次函数y=ax²+bx+c(a≠0)的图象如图所示,①b²-4ac>0② 2a+b<0 ③4a-二次函数y=ax²+bx+c(a≠0)的图象如图所示,①b²-4ac>0② 2a+b<0 ③4a-2b+c=0 ④a:b:c=-1:2:3,其中正确的是 A.①② B.②③ C.](/uploads/image/z/967569-33-9.jpg?t=%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0y%3Dax%26%23178%3B%2Bbx%2Bc%28a%E2%89%A00%29%E7%9A%84%E5%9B%BE%E8%B1%A1%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E2%91%A0b%26%23178%3B-4ac%EF%BC%9E0%E2%91%A1+2a%2Bb%EF%BC%9C0+%E2%91%A24a-%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0y%3Dax%26%23178%3B%2Bbx%2Bc%28a%E2%89%A00%29%E7%9A%84%E5%9B%BE%E8%B1%A1%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E2%91%A0b%26%23178%3B-4ac%EF%BC%9E0%E2%91%A1+2a%2Bb%EF%BC%9C0+%E2%91%A24a-2b%2Bc%3D0+%E2%91%A3a%3Ab%3Ac%3D-1%3A2%3A3%2C%E5%85%B6%E4%B8%AD%E6%AD%A3%E7%A1%AE%E7%9A%84%E6%98%AF+A.%E2%91%A0%E2%91%A1++B.%E2%91%A1%E2%91%A2++C.)
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