匿名用户 2021-09-04 02:32 数学类Mathematics

Let A be the third order matrix, add the second row of A to the first row to get B, and then110 add the first column of ... 查看全部

匿名用户 2021-09-04 02:31 数学类Mathematics

If f (x,) is a continuous function, then then de f( rcos 0, rsin 0)rdr is equal to what?

匿名用户 2021-09-04 02:28 数学类Mathematics

Assume that the random variables x and Y are independent of each other, and both obey the uniform distribution on the in... 查看全部

匿名用户 2021-09-04 02:26 数学类Mathematics

21 Let matrix:A= is the identity matrix of order 2, and matrix B satisfies12 BA=B+2E, Calculate the Bl.

匿名用户 2021-09-04 02:24 数学类Mathematics

Calculate the distance from the point(2,1,0) to the plane3x+4y+5z=0.

匿名用户 2021-09-04 02:24 数学类Mathematics

Let be the lower side of the cone=√x2+y2(0≤z≤1) calculate xdydz+2 2ydzdx+3(z-1)dxdy

匿名用户 2021-09-04 02:23 数学类Mathematics

Compute the general solution to the differential equation y (1-x)

匿名用户 2021-09-04 02:22 数学类Mathematics

To calculate lim xIn(+x)x→01-cosx

匿名用户 2021-09-04 02:21 数学类Mathematics

Set X1 X 2,., X (n >2). is a simple random sample from the population N(,1),X is the sample mean, denote Y;X-,i=1,2,…... 查看全部

匿名用户 2021-09-04 02:20 数学类Mathematics

Let the probability density of the two-dimensional random variable (,) bef(x1,0