x=2时,代数式ax^5+bx^3+cx+2的值为-3
a2^5+b2^3+c2+2=-3
a2^5+b2^3+c2=-5
-a2^5-b2^3-c2=5
当x=-2时,代数式ax^5+bx^3+cx+2的值为
-a2^5-b2^3-c2+2
=5+2
=7