设<img src='https://img2.soutiyun.com/latex/latex.action' />则f(-x)=( )
如果X~φ(x),而<img src='http://221.174.24.96:6088/latex/latex.action?latex=xhboasaoeck9xgxlznrce1xizwdpbnthcnjhex17y2n9icb477ymicywxgxlcsb4xgxlcsaxifxc%0d%0aicagys1477ymicyxxgxlcsb477ycmibcxcagiddvviwgjidlhbbku5ygifxlbmr7yxjyyxl9' />,则P(X≤1.5)=( )
积分∫1/x√x<sup>2</sup>-1dx=()<img src='https://img2.soutiyun.com/ask/2021-01-22/980173798513878.png' />
一架3m长的梯子斜靠在墙上,令θ为梯子与墙的夹角,x为梯子下端到墙的距离.如果梯子底部滑离墙壁,求在θ=<img src='https://img2.soutiyun.com/ask/2020-10-28/972719473895025.png' />时关于θ的变化率.
一家追求利润最大化的企业使用两种要素X<sub>1</sub>与X<sub>2</sub>生产产品Y。生产函数为<img src='https://img2.soutiyun.com/ask/2019-12-05/944397577720965.png' />。已知两种要素的价格分别为1和2,产品Y的价格为4。如果产品Y的价格由4涨到6,而其他条件不变,则下列说法不正确的是( )。
随机变量X的概率密度<img src='https://img2.soutiyun.com/latex/latex.action' />,则D(X)=( )
当|x|<1时,<img src='https://img2.soutiyun.com/latex/latex.action' />( ).
函数<img src='https://img2.soutiyun.com/ask/2020-02-15/950624584044227.png' />在x=0处( ).
f(x)在x=x<sub>0</sub>处有定义是<img src='https://img2.soutiyun.com/ask/2020-02-17/950797744758253.png' />存在的( )。
设<img src='https://img2.soutiyun.com/ask/2020-03-11/952811239855432.png' />,则x=1是f(x)在区间[-2,2]上的( ).
设<img src='https://img2.soutiyun.com/latex/latex.action' />,则点x=1是f(x)的( )。
设f(x)=arctanx,则<img src='https://img2.soutiyun.com/latex/latex.action' />( )。
设函数g(x)=1+x,且当x≠0时,<img src='https://img2.soutiyun.com/ask/2020-02-18/950885721858992.png' />,则<img src='https://img2.soutiyun.com/ask/2020-02-18/950885746436467.png' />等于( )
设随机变量X的概率密度为<img src='https://img2.soutiyun.com/latex/latex.action' />,则E(X)=( )
设随机变量X的分布函数<img src='https://img2.soutiyun.com/latex/latex.action' />,则E(X)=( )
试判断下列函数在分界点x=0处是否可导?如果可导,则该函数的导数f’(0)是下列四个结论中的哪一个()。<img src='https://img2.soutiyun.com//1/2021-06-20/993065591395231.png' />
若<img src='https://img2.soutiyun.com/ask/2020-03-10/952728203989995.png' />,x≠0,且f(x)在x=0处连续,则( ).
满足方程f(x)+2<img src='https://img2.soutiyun.com/shangxueba/ask/17673001-17676000/17675800/201510261646105063.jpg' />f(x)dx=x<sup>2</sup>的解f(x)是:()
设L为|x|+|y|=1正向一周,则<img src='https://img2.soutiyun.com/shangxueba/ask/17682001-17685000/17682260/2015102616184650790.jpg' />(-ydx+xdy)/(|x|+|y|)的值为:()<img src='https://img2.soutiyun.com/shangxueba/ask/17682001-17685000/17682260/2015102616184896461.jpg' />
如果f(x)=e<sup>x</sup>,则<img src='https://img2.soutiyun.com/shangxueba/ask/18747001-18750000/18749502/2016071617275141166.jpg' />等于:()<img src='https://img2.soutiyun.com/shangxueba/ask/18747001-18750000/18749502/2016071617274553502.jpg' />
若f(x)为连续函数,且F'(x)=f(x),则<img src='https://img2.soutiyun.com/ask/2020-08-13/966175500936834.png' />().此题为判断题(对,错)。
一平面简谐波沿x轴正向传播,振幅为A=0.02m,周期T=0.5s,波长λ=100m,原点处质元初相位φ=0,则波动方程的表达式()。<img src='https://img2.soutiyun.com/ask/uploadfile/4317001-4320000/7d1688b31844a985e9da333fae22ad7f.jpg' />
将函数f(x)=x<sup>2</sup>在<img src='https://img2.soutiyun.com/shangxueba/ask/18735001-18738000/18737342/2016071617062459326.jpg' />上展开成余弦级数,其形式为<img src='https://img2.soutiyun.com/shangxueba/ask/18735001-18738000/18737342/2016071617063532608.jpg' /><img src='https://img2.soutiyun.com/shangxueba/ask/18735001-18738000/18737342/2016071617065141640.jpg' />()<img src='https://img2.soutiyun.com/shangxueba/ask/18735001-18738000/18737342/2016071617071375522.jpg' />
读下图(坐标箭头方向表示增大方向),回答以下问题。<img src='https://img2.soutiyun.com/shangxueba/ask/18378001-18381000/18378131/201512101532571110.jpg' />如果X、Y、Z分别代表交通、科技、和环境对某城市工业区布局的影响程度,则d工业区最可能位于()