已知31=3,32=9,33=27,34=81,35=243,36=729,….推测32016的个位数字是( )
A:1
B:3
C:7
D:9
“上海小楼,南湖游船,开天辟地,谱写新篇”描述的历史事件是( )
A. May I help you ?B: Yes, please. I’d like the blue pants. Can I ____ them on?A: Sure. Wow! They look very nice ____ you.B: But I think ____ too small.A: How do you like this ____ of pants?B: Let me see. Oh, they are OK . How much are they?A:They are 390 yuan.B: 390 yuan ? Are you ____ ? I’ll think about them. Thank you all the same.
2015年春晚过后,为了研究演员上春晚次数与受关注的关系,某网站对其中一位经常上春晚的演员上春晚次数与受关注度进行了统计,得到如下数据:
上春晚次数x(单位:次)
1
2
4
6
8
粉丝数量y(单位:万人)
5
10
20
40
80
(1)若该演员的粉丝数量y与上春晚次数x满足线性回归方程,试求回归方程y∧=b∧x+a∧(精确到整数);
(2)试根据此方程预测该演员上春晚10次时的粉丝数;
b∧=∑i=1nxi-x-yi-y-∑i=1nxi-x-2=∑i=1nxiyi-nx-y-∑i=1nai2-nx-2,a∧=b∧﹣y∧x.