当x→0时 (x)=x-sin ax 与 (x)=(x)^2ln (1-bx) 是等价无穷小,-|||-则 ()-|||-(A) =1, =-dfrac (1)(6) (B) =1, =dfrac (1)(6)-|||-(C) =-1, =-dfrac (1)(6) (D) a=-1 =dfrac (1)(6)

[题目]当 arrow 0 时, (x)=x-sin ax 与 (x)=(x)^2ln (1-bx)-|||-等价无穷小,则 ()-|||-

(1)当x→0时，f(x)=sin(ax^3)与g(x)=x^2ln(1-x)是等价无穷小量，则( ).A. a=1B. a=2C. a=-1D. a=-2

1.单选题(1)当x→0时，f(x)=sin ax^3与g(x)=x^2ln(1-x)是等价无穷小，则（）A. a=1B. a=2C. a=-1D. a=-2

[单选题]当x→0时，f（x）=x-sinax与g（x）=x2ln(1-bx)是等价无穷小，则（　　）.A.B.C.D.

[单选题]当x→0时，f（x）=x-sinax与g（x）=x2ln(1-bx)是等价无穷小，则（　　）.A.B.C.D.

[单选题]当x→0时，f（x）=x-sinax与g（x）=x2ln(1-bx)是等价无穷小，则（　　）.A.B.C.D.

9.当x→0时, (x)=a(x)^3+bx 与 (x)=(int )_(0)^sin x((e)^(t^2)-1)dt 是等价无穷小,则 ()-|||-(A)

1、求极限 lim _(xarrow 0)dfrac (x-sin x)({x)^2ln (1+2x)}

(3)设当x→0时, ^x-(a(x)^2+bx+1) 是比 x^2 高阶的无穷小,则 ()-|||-(A) =dfrac (1)(2) ,b=1 (B) a=

1.当x→0时, (x)=(e)^x-dfrac (1+ax)(1+bx) 为x的三阶无穷小,则a,b分别为 __-|||-(A)1,0; (B) 1/2, 0