课时标准练32数列求和

根底稳固组

1.数列112,314,518,7116,…,(2n-1)+12n,…的前n项和

A.n2+1-12n B.2n2-n+1

C.n2+1-12n-1 D.n2

2.(2025山东滨州模拟)假设数列{an}的通项公式为an=2n+2n-1,则该数列的前10项和为()

A.2146 B.1122

C.2148 D.1124

3.函数f(n)=n2,n为奇数,-n2,n为偶数,且an=f(n)+f(n+1),则a1+a2

A.0 B.100 C.-100 D.10200

4.(2