补充谚语 聪明在于勤奋,路遥知马力,良药苦口利于病,只要功夫深,
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Simon failed the exam again. Because computer games ________ too much of his time.
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设函数f(x)=x^3+bx+c ,曲线y= f(x)在点(1/2)方,f(1/2)号 ))处的切线与y轴垂直. 求b.
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His brother was s________ to five years in prison for attacking others.
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函数及其导数问题 函数f(x)=-x^3+ax^2-4(a∈R)f′(x)是其导函数 函数f(x)=-x^3+ax^2-4(a∈R)
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