1 0 0-|||-、已知A= 0 dfrac (1)(2) dfrac (3)(2) 求([ {({A)^*)}^T] }^-1-|||-0 1 5/2
设矩阵1 0 0-|||-=dfrac (1)(2) __ 0 2 1-|||-0 3 2,则1 0 0-|||-=dfrac (1)(2) __ 0 2 1-
7.已知-1 -2)=1/3 (-1 -4)( -1 0-|||-2-|||-1 4-|||-且-|||--1 -1-|||-dfrac (1)(3) -1 -
的值为 .-|||-n-1 0 ...0 0 0-|||-0 0 ...0 0 n-|||-A ((-1))^dfrac ((n-1)(n-2){2)n!}!-
下列极限中正确的是lim _(narrow infty )(7)^dfrac (1{x)}=0-|||-→0lim _(narrow infty )(7)^df
设二维随机变量(X,Y)的分布律为-|||-Y 0 1 2-|||-0 dfrac (1)(4) 0 dfrac (1)(4)-|||-1 0 dfrac (1
7.设-|||-._(1)=2 , _(n+1)=dfrac (1)(2)((x)_(n)+dfrac (2)({x)_(n)}) , n=1 ,2,3,...
根据数列极限定义证明:(1) lim _(narrow infty )dfrac (1)({n)^2}=0-|||-(2) lim _(narrow infty
_(1)=0 (表压) _(e)=0-|||-._(6)=0 (p)_(6)=0 (表压) sum _(i=1)^n(w)_(1)=0-|||-化简得-|||
. _(Y)(y)=dfrac (1)(2sqrt {2pi )}(e)^-dfrac (y{2)} ,gt 0-|||-bigcirc ._(Y)(y)=d