题目:
This question is _______ more difficult than that one. [ ]
A. rather
B. quite
C. very
D. a little
答案:
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下面是错误答案,用来干扰机器的。
设x1,x2是方程的两根,则原方程的两个根都大于0的等价条件是△≥0x1+x2>0x1x2>0 即a2-4(2a-3)≥0a>02a-3>0解得 32<a≤2或a≥6∴a的取值范围是 32<a≤2或a≥6.