1.求下列函数的极值:-|||-(1) =2(x)^3-6(x)^2-18x+7 ;-|||-(2) =x-ln (1+x) ;-|||-(3) =-(x)^4+2(x)^2 ;-|||-(4) =x+sqrt (1-x) ;-|||-(5) =dfrac (1+3x)(sqrt {4+5{x)^2}} ;-|||-(6) =dfrac (3{x)^2+4x+4}({x)^2+x+1} ;-|||-(7) =(e)^xcos x ;-|||-(8) =(x)^dfrac (1{x)} ;-|||-(9) =3-2((x+1))^dfrac (1{3)}-|||-;(10) =x+tan x .

1.求下列函数的极值:-|||-(1) =2(x)^3-6(x)^2-18x+7 ;-|||-(2) =x-ln (1+x) ;-|||-(3) =-(x)^4

1.求下列函数的极值:-|||-(1) =2(x)^3-6(x)^2-18x+7 ;-|||-(2) =x-ln (1+x) ;-|||-(3) =-(x)^4

1.求下列函数的极值:-|||-(1) =2(x)^3-6(x)^2-18x+7 ;-|||-(2) =x-ln (1+x) ;-|||-(3) =-(x)^4

1.求下列函数的极值.-|||-(2) =2(x)^3-6(x)^2-18x+7 ;-|||-__

3.【单选题】求函数=2(x)^3-6(x)^2-18x+7-|||-__ __的极值。（）=2(x)^3-6(x)^2-18x+7-|||-__ __=2(x

1.求 =2(x)^3-6(x)^2-18x-7 的单调区间和极值

1.求极限lim_(xto0)([x-ln(x+sqrt(1+x^2))]sin x^2)/([x-ln(1+x)](arctan x-x)).1.求极限$\l

10.求下列函数的极值:-|||-(1) (x)=|x((x)^2-1)|;-|||-(2) (x)=dfrac (x({x)^2+1)}({x)^4-(x)^

1.已知方程组 ) (x)_(1)+(x)_(2)+(x)_(3)+(x)_(4)=2 3(x)_(1)+2(x)_(2)+(x)_(3)+(x)_(4)=a

求二次型 ((x)_(1),(x)_(2),(x)_(3))=4({x)_(2)}^2-3({x)_(3)}^2+4(x)_(1)(x)_(2)-4(x)_(1