匿名用户 2021-08-16 20:42 数学类Mathematics

Let (a×b) · c=2,find [(a+b)×(b+c)]· (c+a).

匿名用户 2021-08-16 20:38 数学类Mathematics

Find the equation of the tangent plane of the surface  parallel to the plane 2x + 2y-z=0.

匿名用户 2021-08-16 20:36 数学类Mathematics

Let the probability density of the random variable X be find the probability density 

匿名用户 2021-08-16 20:35 理学Science

 Let X and Y be two random variables, and

匿名用户 2021-08-16 20:32 数学类Mathematics

 Let x represent the number of times that 10 independent repeated shots hit the target with a probability of 0.4,calcula... 查看全部

匿名用户 2021-08-16 20:28 数学类Mathematics

Let the eigenvalue of the 3rd order real symmetric matrix A be λ₁=-1,λ₂=λ₃=1,

匿名用户 2021-08-16 20:24 数学类Mathematics

Function f (x) and g (x) in [a, b] the second derivative, and g"(x)≠0, f (a)=f (b) = g (a) = g (b) = 0.Test certificate:

匿名用户 2021-08-16 20:20 数学类Mathematics

Let the function Q(x,y) have the first continuous partial derivative Q(x,y) on the plane, and the curve integralis indep... 查看全部