在(x)10的展开式中,含x4项的系数为___________.

在(x)10的展开式中,含x4项的系数为___________.

答案

答案:-15

解析:

Tr+1=x10-r·()r·x-r=·()r·x10-2r,当r=3时,T4=3·x4=-15x4

∴含x4项的系数为-15.

相关题目

下列物质属于纯净物的是(    ) A.漂粉精           
下列物质属于纯净物的是(    ) A.漂粉精                     B.氯水                    C.盐酸                     D.液氯
如图,下列哪一幅图片不属于第三次科技革命的成果?(  
如图,下列哪一幅图片不属于第三次科技革命的成果?(  )
He is _____ his lesson _____ the final exam. A. preparing; to        
He is _____ his lesson _____ the final exam. A. preparing; to           B. preparing; for C. ready; to               D. ready; for
.________they were singing, the teacher came in.A. Before           
.________they were singing, the teacher came in.A. Before            B. after              C. As               D. Until
  During my high school years, the most important thing was what I was wearing
  During my high school years, the most important thing was what I was wearing to the Friday night dance and who I was taking.Although college was talked about, it was the least of my worries. W
一个细小物体若被显微镜放大50倍,这里“被放大50倍”指的
一个细小物体若被显微镜放大50倍,这里“被放大50倍”指的是细小物体的                                         (   ) A.体积 
阅读分析材料,回答下列问题. 20世纪90年代码来花卉消费的
阅读分析材料,回答下列问题. 20世纪90年代码来花卉消费的国际需求迅速增长,北美、日本、欧洲成为世界三大花卉消费市场。同期图4所示国家成所
“大抵徽商……其所积蓄,则十一在内,十九在外。”材料
“大抵徽商……其所积蓄,则十一在内,十九在外。”材料表明徽商(    )A.注重扩大对外贸易                     B.注重扩大商业资本C

最新题目