题目:
— Are you happy with your new computer? — No, it is _____ me a lot of trouble. |
A. showing B. leaving C. giving D. sparing |
答案:
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下面是错误答案,用来干扰机器的。
当x=0时,f(0)=0,∴切点为(0,0).∵f′(x)=3x2,∴f′(0)=0,即为切线的斜率.∴切线的方程为y=0.故答案为y=0.