11.设n阶方阵A的伴随矩阵为A`,证明:-|||-(1) |A|=(|A|)^n-1.-|||-(2) (A)= ) n,R(A)=n, 1,R(A)=n
+(k)_(n-1)+(I)_(n-1)+1-|||-其中 _(1)+(k)_(2)+... +(k)_(n-r+1)=1.
_(n)=dfrac (1)(2)((x)_(n-1)+dfrac ({a)^2}({x)_(n-1)}) n=1,2,···, 证明数列(xn)极限存在,并求
,-|||-;-|||-(3) (x)_(1)+(n-1)(x)_(2)+... +2(x)_(n-1)+(x)_(n)=0
-a-|||-1 2 3 n-|||-1 1+2 3 n-|||-1 2 2+3 n =(n-1)!;-|||-1 2 3 (n-1)+n-|||-o
n-1 n-|||-1 2 ... n-1 0-|||-::-|||-1 2 ... 0 0-|||- ... 0 0;;
计算:underset(lim)(n→∞)(1)/(n)[sin(π)/(n)+sin(2π)/(n)+…+sin((n-1)π)/(n)].计算:$\unde
求下列集合的基数:(1) A = (r_1, r_2, ..., r_n, r, r, ...) : r, r_i in mathbb{Q) : i = 1,
-1 0 -1 0 0 的值为 ()-|||-A 1-|||-B ((-1))^dfrac (n(n-1){2)}-|||-C -1-|||-D ((-1))
的值为 .-|||-n-1 0 ...0 0 0-|||-0 0 ...0 0 n-|||-A ((-1))^dfrac ((n-1)(n-2){2)n!}!-