设f'(x)=e^(-x^2),limf(x)=0,求∫(0,+∞)x^2*f(x)dx

设f'(x)=e^(-x^2),limf(x)=0,求∫(0,+∞)x^2*f(x)dx 设函数在（-∝,∞)内可导,且f(x)=e^-2x+limf(x),x->0则f'(x)等于? 设x→0,limf(x)/x=0,f''(0)=4,证明:x→0,limf(x)/x^2=2 设F(x)在x=0处连续,已知当x趋近于0时,lim(1+f(x)/x)^1/sinx=e^2,求当x趋近于0时,limf(x)/x^2 设函数f(x-1)=x^2+2x-4,则limf(x)=?(x->0 ) 设f(0)=0,f'(0)=2,求limf（x）/sin 2x ,x 趋向于0 设f(x)=当x0时为arccot-2/(x^2),求lim f(x) x->0-,lim f(x)x->0+,limf(x) x->0 设函数f(x,y)=xy/根号x^2+y^2,求limf(x,y)x,y趋于0 lim(1+f(x)sinx)^1/2 -1 /(e^x-1)=2 x->0 则limf(x)=? 设f(x)=1/（a+|a|e^bx）在R上连续且limf(x)=0(X趋于负无穷）确定a,b符号求limf(x)的值 x趋于正无穷 设f(1)=2,且f’(1)=3,则limf（x）=?（x趋向1） 设极限limf(x) (x→1)存在,且f(x)=3x²＋2xlimf(x) (x→1),求f(x) 函数f(x,y)=xy/x*2 y*2,求limf(x,y)与limf(x,y) 设f(x)在(a,+∞)内可导,且limf(x)=A>0(当x-->+∞),证明limf(x)=+∞(当x-->+∞) 设f(x)在R上连续,且limf(x)=A(x-->-∞),limf(x)=B(x-->+∞),A*B 设limf(x)=A,且A>0,证明lim根号f(x)=根号A 设limf(x)=∞,(x->0),则当x->0时,一定是无穷小量的是()选项有A.x^2*f(x)b.|x|/(x*f(x))c.e^(-f(x))d.f(x)-1/x这是一道08年的MPA题目,我个人选的是C,可是答案是B,有人知道C哪里不对吗? 设函数f（x）在x=1处连续,且limf（x）/x-1的极限=2,则f(1)等于多少