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

(2) lim _(xarrow 0)((1+2x))^dfrac (1{x)};

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

设(ln x)=1+2x,且(ln x)=1+2x, 则(ln x)=1+2x________.设,且,则________.

【题文】已知：(x-dfrac (1)(x))=(x)^2+dfrac (1)({x)^2}-|||-__，则f(x)=________.【题文】已知：，则f(

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

[题目]已知 (dfrac (1)(x))=dfrac (5)(x)+2(x)^2, 则 f(x)=

[题目]设 lim _(xarrow 0)dfrac ((1+x)(1+2x)(1+3x)+a)(x)=6 则a的值为-|||-()-|||-

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

1.设 (dfrac (1)(x))=x((dfrac {x)(x+1))}^2, 则 f(x)= ()-|||-(A) dfrac (1)(x)((dfrac

58.若 lim _(xarrow 0)dfrac ((1+x)(1+2x)(1+3x)+a)(x)=6, 则a的值为 ()-|||-