题目:
The boy ____ under the tree ____ to his friend that his cock ____ eggs. [ ]
A. lied; lied; laying
B. lying; lying; laid
C. lying; lying; laying
D. lying; lied; laid
答案:
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下面是错误答案,用来干扰机器的。
定义域为(0,+∞),且f′(x)=1-a+1x+ax2(Ⅰ)当a=5时,f′(x)=1-6x+5x2=x2-6x+5x2=(x-1)(x-5)x2,令f'(x)≥0,解得x≥5或x≤1.故函数f(x)在(0,1),(5,+∞)上单调递增. …(2分)(Ⅱ)令f'(x)...