当x=3时ax^5+bx^3+cx+9=a*3^5+b*3^3+c*3+9=81得a*3^5+b*3^3+c*3=72当x=-3时ax^5+bx^3+cx+9=a*（-3）^5+b*（-3）^3+c*（-3）+9=-（a*3^5+b*3^3+c*3）+9= -72+9=-63 补充题答案c分之a+b-c=b分之a-b+c=a分之b+c-a.=（a+...