1.lim(x→0）[(1/x^2)-(1/xsinx)] 2.lim(x→0) [(1/e^x -1)-(1/x)] 3.lim(x→0) [(1/x-1)-(2/x^2 -1)]
4.f'(x)=k,求 lim(x→0）[(f(x0+2x)-f(x0-x))/x] 5.f(x)={x^3sin(1/x),x不等于0,0,x=0 ,则f'(0)=?6.y=3^x,求y^(100)(0) 7.y=x^2arctanx,求dy,y'',8.y=(x+1)e^((x^2)+1),求dy,y''