设y=x3+x+1,当x=2,Δx=0.01时分别计算Δy和dy.

设y=x3+x+1,当x=2,Δx=0.01时分别计算Δy和dy.
【正确答案】:Δy=f(2+0.01)-f(2)=0.1306. dy=f′(x)Δx=f′(2)•0.01=0.13