x
﹣1
0
1
2
3
f(x)
﹣0.677
3.011
5.432
5.980
7.651
g(x)
﹣0.530
3.451
4.890
5.241
6.892
(1)f(x1+x2)=f(x1)f(x2)
(2)f(x1x2)=f(x1)+f(x2)
(3)
当f(x)=ex时,上述结论中正确结论的序号是.