匿名用户 2021-09-24 17:54 数学类Mathematics

Let the standard form of the quadratic form f(x1, X2, X3) under the orthogonal transformation =Py be 2yi +y2-y3 2_2 wher... 查看全部

匿名用户 2021-09-24 17:55 数学类Mathematics

To calculatelim In(cos x)0x2

匿名用户 2021-09-24 17:55 数学类Mathematics

Let the random variables X and Y be irrelevant and E(X)=2, E()=1, D(X)=3, to calculateEX(X+y-2)

匿名用户 2021-09-24 17:54 数学类Mathematics

Let D be the plane region bounded by the curve 2xy=1, 4xy=1 and the line=x,= v3x in the first quadrant, where the functi... 查看全部

匿名用户 2021-09-24 17:53 数学类Mathematics

Let y=e+x-e be a particular solution of the second order nonhomogeneous linear differential equation y"+ay'+ by ce*. Com... 查看全部

匿名用户 2021-09-24 17:53 数学类Mathematics

Let the probability distribution of random variable X be=1}=P[X=2)=, given X=i, the random variable Y obeys the uniform ... 查看全部

匿名用户 2021-09-24 17:52 数学类Mathematics

4 Let A=021231 1, E is the third order identity matrix.10-3 ()Find a basic solution system of equations Ax=0; (1)Find al... 查看全部

匿名用户 2021-09-24 17:51 数学类Mathematics

Let the sequence{an},{bn} satisfy0

匿名用户 2021-09-24 17:50 数学类Mathematics

Let be the surface z =x2+y2() on the upper side of, calculate the surface integral.x-1)3=(x-1)'dydz+(y-1)'dzdx+(z-1) dxd... 查看全部

匿名用户 2021-09-24 17:50 数学类Mathematics

Let the function f(u)have a second continuous derivative z =f(e' cos) such that dzdz +=(+e cos)e"., if f() 0,() 0. Find ... 查看全部