问题
填空题
已知:f0(x)=xex,若fi(x)=f′i-1(x)(i=1,2,3,…),则f2010(x)=______.
答案
∵f0(x)=xex,
∴f1(x)=f0'(x)=ex+xex
f2(x)=f1'(x)=ex+ex+xex=2ex+xex
f3(x)=f2'(x)=2ex+ex+xex=3ex+xex
…
∴fn(x)=nex+xex
∴f2010(x)=2010ex+xex
故答案为:2010ex+xex