设f(x)=1,当lxl1 求f[g(x)]和g[f(x)],
问题描述:
设f(x)=1,当lxl1 求f[g(x)]和g[f(x)],
答
le^xlxle^xl=1x=0.
le^xl>1x>0.
f[g(x)]={1(x0)}
g[f(x)]=e^f(x)={e(lxl1)}