Let be the third-order real symmetric matrix and E be the third-order identity matrix. If A2+A=2E, and [Al=4. Compute th... 查看全部
2021-10-11 11:52
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回答When, if x-tanx is infinitesimal of the same order as x, to calculate k
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回答Let' s say the probability density of population is(x;)=e,-∞
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回答Let the random variables X and Y be independent, and the probability distribution of X be PlX=1==-1 Y obeys Poisson dist... 查看全部
2021-10-11 11:51
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回答(12a We know that is a constant, and the matrix A =1 3 0 can be transformed into27-a1a2 matrix B =0 1 1by elementary col... 查看全部
2021-10-11 11:51
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回答Let the real quadratic form(x1,x2,x3)=(x1-2+x3)2+(x2+x3)2+(x1+ax3)2 where a is the parameter.(1)Find the solution(x1,x2,... 查看全部
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回答Let the sequence{xn} satisfy1>0,xnen+=e-1(n=1,2,). Prove the convergence of sequence {xn} and find lim.n
2021-10-11 11:51
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回答We have the differential equation y'+ y f (x), where f() is a continuous function on R. ()If f(x) =x, find the general s... 查看全部
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回答So let's' say is positive=1-3y2-3z2. Compute the surface integral=xdydz+(+)dzdx +2dxdy.
2021-10-11 11:50
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回答there a minimum value in the sum of the areas of the three figures, namely circle, square and regular triangle, divided ... 查看全部
2021-10-11 11:50
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