一道AMC数学题The real number c,b,a form an arithmetic sequence with a≥b≥c≥0.The quadratic ax²+bx+c has exactly one root.What is this root?(A) -7-4√3(B) -2-√3(C) -1(D) -2+√3(E)-7+4√3
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![一道AMC数学题The real number c,b,a form an arithmetic sequence with a≥b≥c≥0.The quadratic ax²+bx+c has exactly one root.What is this root?(A) -7-4√3(B) -2-√3(C) -1(D) -2+√3(E)-7+4√3](/uploads/image/z/13202183-47-3.jpg?t=%E4%B8%80%E9%81%93AMC%E6%95%B0%E5%AD%A6%E9%A2%98The+real+number+c%2Cb%2Ca+form+an+arithmetic+sequence+with+a%E2%89%A5b%E2%89%A5c%E2%89%A50.The+quadratic+ax%26%23178%3B%2Bbx%2Bc+has+exactly+one+root.What+is+this+root%3F%28A%29+-7-4%E2%88%9A3%28B%29+-2-%E2%88%9A3%28C%29+-1%28D%29+-2%2B%E2%88%9A3%28E%29-7%2B4%E2%88%9A3)
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