问题:曲线y=x+sin2x在点(π/2,1+π/2)处的切线方程是____。...
Saturday, September 17, 2022
问题:设函数u=u(x,y)满足∂2u/∂x2-∂2u/∂y2=0及条件u(x,2x)=x,ux′(x,2x)=x2,u有二阶...
Wednesday, September 21, 2022
问题:过x轴和点(1,-1,2)的平面方程为____。...
Thursday, September 15, 2022
问题:方程y″-3y′+2y=excos2x的特解形式y*=( )。...
Thursday, September 22, 2022
问题:两曲线y=1/x,y=ax2+b在点(2,1/2)处相切,则( )。...
Friday, September 16, 2022
问题:问答题设A是n阶方阵,AAT=E,|A|<0,求|A+E|,其中AT是A的转置矩阵....
Monday, December 11, 2023
问题:填空题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____。...
Sunday, August 20, 2023
问题:设三向量a(→),b(→),c(→)满足关系a(→)·b(→)=a(→)·c(→),则( )。...
Wednesday, September 21, 2022
问题:设分别自总体N(μ1,σ2)和N(μ2,σ2)中抽取n1、n2(n1、n2均大于1)的两独立样本,其样本方差分别为S12...
Thursday, September 22, 2022
问题:非齐次线性方程组AX(→)=b(→)中未知数个数为n,方程个数为m,系数矩阵A的秩为r,则( )。...
Tuesday, September 20, 2022
问题:如果二阶常系数非齐次线性微分方程y″+ay′+by=e-xcosx有一个特解y*=e-x(xcosx+xsinx),则(...
Wednesday, September 21, 2022
问题:设向量组α(→)1,α(→)2,α(→)3线性无关,则下列向量组线性相关的是( )。...
Sunday, September 18, 2022
问题:设α(→)1=(a1,a2,a3)T,α(→)2=(b1,b2,b3)T,α(→)3=(c1,c2,c3)T,则三条直线...
Wednesday, September 14, 2022
Wednesday, September 21, 2022
问题:设z=e-x-f(x-2y),且当y=0时,z=x2,则∂z/∂x=____。...
Wednesday, September 21, 2022
问题:单选题若事件A、同时出现的概率P(AB)=0,则( )。A A和B互不相容B AB是不可能事件C AB未必是不可能事件D P(A)=0或P(B)=0...
Friday, February 10, 2023
问题:填空题设函数y=1/(2x+3),则y(n)(0)=____。...
Wednesday, January 31, 2024