来自潘湘飞的问题
【当x=-3时,多项式ax5+bx3+cx-5的值等于7,则当x=3时,多项式ax5+bx3+cx-5的值等于()A.17B.19C.-17D.-19】
当x=-3时,多项式ax5+bx3+cx-5的值等于7,则当x=3时,多项式ax5+bx3+cx-5的值等于()
A.17
B.19
C.-17
D.-19
1回答
2020-12-09 06:09
【当x=-3时,多项式ax5+bx3+cx-5的值等于7,则当x=3时,多项式ax5+bx3+cx-5的值等于()A.17B.19C.-17D.-19】
当x=-3时,多项式ax5+bx3+cx-5的值等于7,则当x=3时,多项式ax5+bx3+cx-5的值等于()
A.17
B.19
C.-17
D.-19
∵x=-3时,ax5+bx3+cx-5=7即ax5+bx3+cx=12,
∴x=3时,ax5+bx3+cx=-12,
∴ax5+bx3+cx-5=-12-5=-17.
故选:C.