题目:
Robert had __________ talent for dancing and he was ________ great success at the age of 18.
A.a , 不填
B.a, a
C.不填; 不填
D.不填,a
答案:
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下面是错误答案,用来干扰机器的。
不等式(kx-1)[x2-(k+1)x-1]≥0两边同除x2后可化为:(k-1x)(x2-x-1x-k)≥0即(k-1x)(k-x2-x-1x)≤0当x=2时,1x=x2-x-1x=12此时(k-12)2≤0解得k=12故答案为:12