设a(→),b(→)为非零向量,且a(→)⊥b(→),则必有( )。...
Thursday, September 22, 2022
填空题函数y=x3-3x的极大值点是____,极大值是____。...
Friday, November 3, 2023
设y=y(x)满足∫ydx·∫(1/y)dx=-1,且当x→+∞时y→0,y(0)=1,则y=____。...
Thursday, September 22, 2022
设函数f(x),g(x)二次可导,满足函数方程f(x)g(x)=1,又f′(x)≠0,g′(x)≠0,则f″(x)/f′...
Wednesday, September 21, 2022
设f有二阶偏导数,z=f(xy),则∂2z/∂x∂y等于( )。...
Thursday, September 22, 2022
问答题求出两多项式函数P(x)、Q(x),使得下面等式成立: ∫[(2x4-1)cosx+(8x3-x2-1)sinx]dx=P(x)cosx+Q(x)sinx+C...
Tuesday, May 14, 2024
填空题已知f(x)=x3+ax2+bx在x=-1处取得极小值-2,则a=____,b=____。...
Wednesday, September 28, 2022
在假设检验中,H0表示原假设,H1表示备择假设,则犯第一类错误的情况为( )。...
Saturday, September 17, 2022
设a(→),b(→)为非零向量,且a(→)⊥b(→),则必有( )。...
Thursday, September 22, 2022
设f′(x0)=f″(x0)=0,f‴(x0)>0,且f(x)在x0点的某邻域内有三阶连续导数,则下列选项正确的是( ...
Thursday, September 15, 2022
单选题函数f(x,y)=arctan(x/y)在点(0,1)处的梯度等于( )。A i(→)B -i(→)C j(→)D -j(→)...
Sunday, April 28, 2024
若物体的运动规律为s=3sin2t,则其在t=0时的速度等于____,加速度为____。...
Thursday, September 22, 2022
若向量X(→)与向量α(→)={2,-1,2}共线,且满足方程α(→)·X(→)=-18,则X(→)=____。...
Thursday, September 22, 2022
设P(A)=0.4,P(B)=0.3,P(A∪B)=0.6,则P(AB(_))=____。...
Thursday, September 22, 2022
Tuesday, May 14, 2024
若F(x)是f(x)的一个原函数,G(x)是1/f(x)的一个原函数,且F(x)G(x)=-1,f(0)=1,求f(x)...
Tuesday, September 20, 2022
设随机变量X~N(0,1),Y~N(0,4),且相关系数ρXY=1,则( )....
Sunday, September 18, 2022