A．8 B．6 C．4 D．10
已知X~N(2,4),则((X)^2)=A.8 B.6 C.4 D.2已知X~N(2,4),则=A.8B.6C.4D.2
确定下列函数的单调区间:-|||-(1) =2(x)^3-6(x)^2-18x-7 ;-|||-(2) =2x+dfrac (8)(x)(xgt 0);-|||
3.确定下列函数的单调区间:-|||-(1) =2(x)^3-6(x)^2-18x-7 ;-|||-(2) =2x+dfrac (8)(x)(xgt 0) .
确定下列函数的单调区间:-|||-=2x+dfrac (8)(x)(xgt 0).
4.函数 (x)=((x-1))^dfrac (1{3)}((x-2))^dfrac (2{3)} 在闭区间[0,4]上的最值是-|||-A.最大值为 sqrt
3.函数 (x)=dfrac (sqrt {x-1)}(x-2)+((x-1))^0 的定义域为 ()-|||-
当x→1时,函数dfrac ({x)^2-1}(x-1)(e)^dfrac (1{x-1)}的极限( ) (A)等于2 (B)等于0
2 , 1 B . 1 , 2 C . (x)=dfrac ({e)^x-1}(x), 1D . (x)=dfrac ({e)^x-1}(x), 2设函数，若当
) ;-|||-(3) =(cos )^2dfrac (1)(x),x=0 =-|||-(4) y= ) x-1,xleqslant 1 3-x,xgt 1
) ;-|||-(3) =(cos )^2dfrac (1)(x),x=0 =-|||-,-|||-(4) y= ) x-1,xleqslant 1 3-x