解 (1)f[f(3)]=f(3)=3. g[f(-1)]=g(0)=0.(2)因?yàn)閒(x)≥0,所以f[f(x)]=f(x).因?yàn)間(x)≤0,所以g[g(x)]=0,f[g(x)]=0.當(dāng)x≤0時(shí),g[f(x)]=g(0)=0;當(dāng)x>0時(shí),g[f(x)]=g(x)=-x2.所以,g[f(x)]=g(x). (本文共 159 字 ) g(x)=求(1) f[f(3)],g[f(-1)]; (2) f[f(x)],g[g(x)],f[g(x)],g[f(x)]." href="javascript:void(0)"> [閱讀本文] >>