题目内容

设α，β是方程x2-28x+36=0的两根，则α与β的等差中项A和等比中项G分别等于()．

A=14，G=6
B. A=14，G=土6
C. A=14，G=36
D. A=-14，G=土36
E. 以上答案均不正确

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