设（X，Y)的分布函数为F（x，y)，试用F（x，y)表示：（1)P{a≤X≤b，Y＜c}；（2)P{0＜Y＜b}；（3)P{X≥a，Y＜b}。

A . ['y=f（x）+chttps://assets.asklib.com/psource/2015102616471385225.jpg B . y=f（x）https://assets.asklib.com/psource/2015102616471475863.jpg -https://assets.asklib.com/psource/2015102616471475863.jpg +cC . y=f（x）-1+chttps://assets.asklib.com/psource/2015102616471385225.jpg D . y=f（x）-1+chttps://assets.asklib.com/psource/2015102616471475863.jpg

A．F2(x) B．F(x) F(y) C．1- [1- F(x)]2 D．[1- F(x)] [1- F(y)]

A．F(5y-3) B．5F(y)-3 C．<img src='https://img2.soutiyun.com/latex/latex.action' /> D．<img src='https://img2.soutiyun.com/latex/latex.action' />

A．A.Y到X的函数 B．B.X到Y的函数 C．C.Y到X的单射 D．D.Y到X的关系

设f(x，y)为连续函数，<img src='https://img2.soutiyun.com/ask/uploadfile/2766001-2769000/13ad2684e5aab0b425f536ce4ab309b3.jpg' />（）<img src='https://img2.soutiyun.com/ask/uploadfile/2766001-2769000/1cb1d88a2e4e034baf23759c42df09f5.jpg' /><img src='https://img2.soutiyun.com/ask/uploadfile/2766001-2769000/99fe3f313cd296681f496a61f8bd3f0d.jpg' /><img src='https://img2.soutiyun.com/ask/uploadfile/2766001-2769000/5e9f42f3b66e17f1010eb8405d5e6d3b.jpg' /><img src='https://img2.soutiyun.com/ask/uploadfile/2766001-2769000/5fbc012b3e13b4f4e8fbc129a807492f.jpg' />

设随机变量X与Y独立且均在(0，1)区间上服从均匀分布，F(x，y)为(X，Y)的联合分布函数，则P(X+Y<1)=()， A.1/2 B.1/3 C.1/4 D.1/5 E.1/6

设f(x)为[0,1]上的非负单调非增连续函数(即当x＜y时,f(x)≥f(y)).利用积分中值 定理证明:对于0＜a＜β＜1.有下面的不等式成立 <img src='https://img2.soutiyun.com/ask/2020-11-30/975612485146551.png' />

设y=f(x)由方程2y³-2y²+2xy-x²=1所确定，求函数y=f(x)的驻点，并判别其是否为极值点

设函数y=f(x)具有二阶导数，且f(x)＞0，f"(x)＞0，△x为自变量x在点x0处的增量，△y与dy分别为f(x)在点x0处对应的增量与微分，若△x＞0，则()． A．0＜dy＜△y B．0＜△y＜dy C．△y＜dy＜0 D．dy＜△y＜0

设随机变量X，Y独立同分布，且X的分布函数为F(x)，则Z=max{X，Y}的分布函数为()． A．F2(x) B．F(x)F(y) C．1 - [1 - F(x)]2 D．[1 - F(x)][1 - F(y)]

设二维随机变量X和Y的联合概率密度为<img src='https://img2.soutiyun.com/ask/uploadfile/11226001-11229000/4fc3fa773ba3ff1b4a790c7f86a536e7.jpg' />求X和Y的联合分布F(x，y)．

设随机变量X在任一区间[a，b]上的概率均大于0，其分布函数为F_X(x)，又Y在[0，1]上服从均匀分布，证明：<img src='https://img2.soutiyun.com/ask/2020-12-28/978002347049789.jpg' />的分布函数与X的分布函数相同。

设f"(x)存在,求下列函数的二阶导数<img src='https://img2.soutiyun.com/ask/2020-11-10/973871310253584.png' />; (1) y=f(x²);(2)y=ln[f(x)].

设函数f(x)有二阶导数,且f"(x)≠1.求由方程<img src='https://img2.soutiyun.com/ask/2020-12-12/976648440000174.png' />确定的隐函数y=y(x)的一、二阶导数.

设随机变量X的分布函数为F(x)。则<img src='https://img2.soutiyun.com/ask/2020-07-24/964431375767443.png' />的分布函数G(y)为()。 A.<img src='https://img2.soutiyun.com/ask/2020-07-24/964431401000886.png' /> B.<img src='https://img2.soutiyun.com/ask/2020-07-24/964431408783331.png' /> C.<img src='https://img2.soutiyun.com/ask/2020-07-24/964431418271873.png' /> D.<img src='https://img2.soutiyun.com/ask/2020-07-24/964431425318276.png' />

A．FY(y) = F(y/2) + 2 B．FY(y) = F(y/2 + 2) C．FY(y) = F(2y) - 4 D．FY(y) = F(2y – 4)