x=3时,代数式ax的五次方+bx的三次方+cx+5=9
∴3^5a+3³b+3c+5=9
3^5a+3³b+3c=4
当x=-3时,ax的五次方+bx的三次方+cx+5
=-3^5a-3³b-3c+5
=-(3^5a+3³b+3c)+5
=-4+5
=-1