单选题-|||-(中)-|||-已知函数 =dfrac ({x)^2+1}(x) ,则 ^m= __-|||-A .dfrac ({x)^2-1}({x)^2} .-|||-B .dfrac ({x)^2-1}({x)^3}-|||-C .dfrac (2)({x)^3}-|||-D 2

.已知 (dfrac (1)(x))=dfrac (4)(x)+2(x)^2+1, 求f(x), ((x)^2+1)

[题目]设 (dfrac (1)(x))=dfrac (x)({x)^2+1} 则 f(x)=

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)^

7.已知函数 (x+dfrac (1)(x))=(x)^2+dfrac (1)({x)^2} ,则 f(x)=-|||-__

设函数=dfrac ({x)^2}(x-1),则=dfrac ({x)^2}(x-1)=________.设函数,则=________.

函数(x)=dfrac (1)(x-2)的间断点是(x)=dfrac (1)(x-2)(x)=dfrac (1)(x-2)、(x)=dfrac (1)(x-2)

已知 (x)=dfrac (x)(1+2x) 则 ^-1(1)=已知 (x)=dfrac (x)(1+2x) 则 ^-1(1)=

求lim _(xarrow infty )dfrac (ln (x+sqrt {{x)^2+1)}-ln (x+sqrt ({x)^2-1})}({({e)^d

(1)已知 (x+dfrac (1)(x))=(x)^2+dfrac (1)({x)^2}, 则 f(x)= __ ;

【题文】已知(x+dfrac (1)(x))=(x)^2+dfrac (1)({x)^2}，求(x+dfrac (1)(x))=(x)^2+dfrac (1)(