-1 . C.0 D.2

1/2 C.0 D. -1-|||-__

2.已知 f(x)= ),xgt 0 kx,xlt 0 B.2 C.0 D 1

(4)矩阵 =(} 1& -1 -1& 1 ) 的特征值为0,2,则3A的特征值为 () .-|||-A.0,2 B.0,6 C.0,0 D.2,6

在 x=0 处连续,则 =1 】-|||-A.2 B.1 C.0 D. -1-|||-A B-|||-C D

-1 D.2

已知_(1)=((a,1,1))^T, (alpha )_(2)=((-1,-1,2))^T是三阶实对称矩阵属于两个不同特征值的特征向量,则a=____.A.1

(int )_(0)^1dfrac (1)(2)xdx= A.1B.0C.(int )_(0)^1dfrac (1)(2)xdx=D.2A.1B.0C.D.2

(1+e)-|||-D.2

sqrt (2) C. sqrt (3) D.2

-(18)^circ C C.0℃