b=1 (B) =2, b=-1 (C) =-2. b=1 (D) =-2, b=-1

2.设行列式 |} (a)_(1)& (b)_(1) (a)_(2)& (b)_(2) |= () .-|||-=-|||-(A) -3; (B) -1 ; (

已知 lim _-|||-A a=-1 , b=2-|||-B a=1 , b=-2-|||-C a=-1 , b=-2-|||-D a=1 , b=2

[题目]-|||-1 1 1 1-|||-a b c d-|||-a^2 b^2 c^2 d^2 =(a-b)(a-c)(a -d)(b-c)(b-d)(c-|

,则常数 A=()().-|||-A -1 ;-|||-B 0;-|||-C )1;-|||-D) 2.

2.用行列式的性质证明下列等式:-|||-_(1)+k(b)_(1) _(1)+(c)_(1) 1 1 b1 C1-|||-(1) _(2)+k(b)_(2)

(P)_(2)(P)_(1)=B C. _(1)(P)_(2)A=B D. _(2)(P)_(1)A=B

( B ) 1 , 1 . ( C ) 2 , 1 . ( D ) 1 , 2二次型的正惯性指数与负惯性指数依次为(A)2,0.(B)1,1.(C)2,1.(D

,则-|||-B的特征值是-|||-(A)1, -1 ,4.-|||-(B)1,1, -4 。-|||-(C)1,2, -2. 。-|||-(D) 1,-1,2

(B)1. (C)2.3.给出以下4个命题①若$\lim_{x\to+\infty}f(x)=a$，则$\lim_{n\to\infty}f(n)=a$.②若$

1+a1b2 . 1+a1b31+a1b4 1+a2b1 . 1+a2b2 . 1+a2b31+a2b4 1+a3b1 . 1+a3b2 . 1+a3b31+a