下列括号中填写的函数正确的是（ ）A.d(x)=2dxB.d(x)=2dxC.d(x)=2dxD.d(x)=2dx

15.求下列已知曲线所围成的图形,按指定的轴旋转所产生的旋转体的体积:-|||-(1) =(x)^2 =(y)^2, 绕y轴;

4.(1)设x为n维列向量 ^Tx=1 ,令 =E-2x(x)^T ,证明H是对称的正交矩阵;(2)设A,-|||-B都是正交矩阵,证明AB也是正交矩阵.

3 (2024,4题,5分)已知数列(a_{n)}(a_(n)≠0),若(a_{n)}发散,则A. a_(n)+(1)/(a_(n))发散.B. a_(n)-(1)/(a_(n))发散.C. e^a_(n)+(1)/(e^a_(n))发散.D. e^a_(n)-(1)/(e^a_(n))发散.

a (1 1-|||-1-|||-16.设向量α1= -1 ,α2= 1 a 若α1,α2,α3线性相关,且其中任意两个向量均线性-|||-b ,α3=-|||-1-|||-1 a 1-|||-无关,则ab-

0.098700保留四位有效数字记作A. 0.099B. 0.0987C. 0.09870D. 0.098

1.判定下列各反常积分的收敛性,如果收敛,计算反常积分的值:-|||-(1) (int )_(1)^+infty dfrac (dx)({x)^4} =-|||-(2) (int )_(1)^+infty dfrac (dx)(sqrt {x)}-|||-(3) (int )_(0)^+infty (e)^-axdx(agt 0) =-|||-(4) (int )_(0)^+infty dfrac (dx)((1+x)(1+{x)^2)}-|||-(5) (int )_(0)^+infty (e)^-msin omega tdt(pgt 0,omega gt 0) :-|||-(6) (int )_(-infty )^+infty dfrac (dx)({x)^2+2x+2} =-|||-(7) (int )_(0)^1dfrac (xdx)(sqrt {1-{x)^2}} =-|||-(8) (int )_(0)^2dfrac (dx)({(1-x))^2} =-|||-(9) (int )_(1)^2dfrac (xdx)(sqrt {x-1)} .-|||-(10) (int )_(1)^edfrac (dx)(xsqrt {1-{(ln x))^2}}

3.求抛物线 =-(x)^2+4x-3 及其在点 (0,-3) 和(3,0)处的切线所围成的图形的面积.

函数=ln (x-1)-1(xgt 1)的反函数

热门问题