一道数学题(只要答第三个问)!如图(图我弄不上,不过应该不影响的),二次函数 y=x^2+(2k–1)x+k+1的图象与x轴相交于O(点O是原点)、A两点.(1)求这个二次函数的解析式; (2)在这条抛物线的
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![一道数学题(只要答第三个问)!如图(图我弄不上,不过应该不影响的),二次函数 y=x^2+(2k–1)x+k+1的图象与x轴相交于O(点O是原点)、A两点.(1)求这个二次函数的解析式; (2)在这条抛物线的](/uploads/image/z/12623367-39-7.jpg?t=%E4%B8%80%E9%81%93%E6%95%B0%E5%AD%A6%E9%A2%98%EF%BC%88%E5%8F%AA%E8%A6%81%E7%AD%94%E7%AC%AC%E4%B8%89%E4%B8%AA%E9%97%AE%EF%BC%89%21%E5%A6%82%E5%9B%BE%EF%BC%88%E5%9B%BE%E6%88%91%E5%BC%84%E4%B8%8D%E4%B8%8A%2C%E4%B8%8D%E8%BF%87%E5%BA%94%E8%AF%A5%E4%B8%8D%E5%BD%B1%E5%93%8D%E7%9A%84%EF%BC%89%2C%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0+y%3Dx%5E2%2B%282k%E2%80%931%29x%2Bk%2B1%E7%9A%84%E5%9B%BE%E8%B1%A1%E4%B8%8Ex%E8%BD%B4%E7%9B%B8%E4%BA%A4%E4%BA%8EO%EF%BC%88%E7%82%B9O%E6%98%AF%E5%8E%9F%E7%82%B9%EF%BC%89%E3%80%81A%E4%B8%A4%E7%82%B9.%281%29%E6%B1%82%E8%BF%99%E4%B8%AA%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0%E7%9A%84%E8%A7%A3%E6%9E%90%E5%BC%8F%EF%BC%9B+%282%29%E5%9C%A8%E8%BF%99%E6%9D%A1%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84)
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