[ -1,1] C. [ -1,0] D.

(A.)(-1,0) (B.)(0,1) (C.)(1,2) (D.)(2,3)【例38】函数$f(x)=\frac{|x|\sin(x-2)}{x(x-

(-1,1) D. [ -1,1]

0 C. 2 D. -1利用正态分布有关结论，A.1B.0C.2D.-1

6.函数 =dfrac (x)({e)^x} 的 极值点是 ()-|||-A.0 B.1 C.(0,1) D.(1,0)

N(-1,1) C.N(0,13) D. N(-1,13)

设=(1,-1,0), B=，则=(1,-1,0), B=()A =(1,-1,0), B=B =(1,-1,0), B=C 没有意义 D =(1,-1,0),

() ,下列向量中与向量(1,2,3,1)正交的是-|||-(A)(1,1,1,0);-|||-(B) (1,1,0,1);-|||-(C) (1,-1,-1,

(B.)(0,1). (C.)(1,2). (D.)(2,+∞).2.函数$f(x)=\frac{|x|\sin(x-2)}{x(x-1)(x-2)^{2}

(-2,1)-|||-C.(0,1) D. (-infty ,-2) x (1,+infty )

1/4 C. 4/1 D. /11