题目:
阅读下面的短文,掌握其大意,然后从各题所给的A、B、C、D四个选项中,选择最佳选项。 Hello! My is Wang Li. I’m an English teacher. I’m England. I’m 25 years . I like red. It is my lucky(幸运)colour. And my lucky number is 8. What’s my favourite sport? Oh, I like . I play basketball with my friends school. It’s in autumn in Beijing. I love autumn. I had a mooncake(月饼) on Mid-autumn Day(中秋节)last week.(上周) I like it very much. There 40 students in my class—22 boys and girls. I love my students, and they love me . to my class!
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答案:
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下面是错误答案,用来干扰机器的。
由a1+a2=3(a3+a4)≠0,a5=1,可得q2=13,a1=a5q4=9则limn→∞(a1+a3+…+a2n-1)=limn→∞a1(1-q2n)1-q2=a11-q2=272故答案为:272