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习题2
1.函数平均变化率与x和Δx有关吗?瞬时变化率
与x和Δx有关吗?在平均变化率取极限的过程中Δx是变量还是常量?x是变量还是常量?
2.设函数f(x)在x0点可导,且f′(x0)=k,计算:
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3.按定义计算下列函数在指定点的导数:
(1),在点x=0处.
(2)f(x)=3x2-x+4,在点x=0处.
4.讨论下列函数在x=0处是否可导:
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5.设函数.试确定a,b的值,使f(x)在x=1点处既连续又可导.
6.求函数f(x)=x3在(1,1)点处的切线方程与法线方程.
7.求下列函数的导数:
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(15)y=arcsin(2x2-1)+ln 2. (16)y=(tan x)sin x.
(17)y=(sin x)cos x. (18)y=xlnx.
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8.求由下列方程确定的隐函数y=f(x)的导数.
(1)y=1+xey. (2)y=tan(x+y).
(3)x3+y3-3axy=0. (4)xy=ex+y.
9.方程xy-ex+ey=0确定y是x的隐函数,求y′|x=0的值.
10.求下列参数方程所确定的函数的导数.
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11.求下列函数的二阶导数.
(1)y=eax. (2)y=lnx.
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12.求下列函数的微分.
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13.利用微分近似计算.
(1)sin 29°. (2)(1.05)3.