当x=2时,多项式ax5+bx3+cx﹣5的值为7,则当x=﹣2时,这个多项式的值为

x=2时,多项式ax5+bx3+cx5的值为7,则当x=2时,这个多项式的值为__________

答案

17

【考点】代数式求值;多项式.

【专题】整体思想

【分析】两个相反数的奇次方都互为相反数解答.

【解答】解:x=2时,ax5+bx3+cx5=7ax5+bx3+cx=12

x=2ax5+bx3+cx=12

原式=125=17

【点评】此题考查的是相反数的性质,根据相反数的奇次方也互为相反数可解此题.

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