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A 题组新编1 .( 1 )若关于 x的两方程 x2 + ax + 1 =0和 x2 + bx + 1 =0 ( a≠ b)的四个根可以排成一个以 2为公比的等比数列 ,则 ab=;( 2 )若关于 x的方程 x2 - x + a =0和x2 - x + b =0的四个根可以排成一个以 14为首项的等差数列 ,则 a + b =.(颜为华供题 )2 .( 1 )以抛物?
The new group A is 1. (1) if the four roots of the two equations x2 + ax + 1 =0 and x2 + bx + 1 =0 (a≠ b) for x can be arranged in a ratio of two. If the array of equal ratios is ab=; (2) if the four roots of the equations x2 - x + a =0 and x2 - x + b =0 for x can be arranged as an arithmetic progression with the leading term of 14, then a + b =. (Yan Weihua for questions) 2. (1) Parabolic?