>
数学
>
等差数列{a
n
}中,a
1
+a
4
+a
10
+a
16
+a
19
=150,则a
20
-a
26
+a
16
的值是______.
人气:418 ℃ 时间:2020-10-02 03:05:11
解答
∵a
1
+a
4
+a
10
+a
16
+a
19
=5a
10
=150,
∴a
10
=30,
则a
20
-a
26
+a
16
=(a
1
+19d)-(a
1
+25d)+(a
1
+15d)
=a
1
+9d=a
10
=30.
故答案为:30
推荐
等差数列{an}中,a1+a4+a10+a16+a19=150,则a18-2a14的值是 _.
在等差数列{an}中,a1+a4+a10+a16+a19=100,则a16-a19+a13的值是_.
{an}是等差数列,a4=-20,a16=16,则|a1|+|a2|+…+|a20|=_.
等差数列{an}a4+a10+a16=30 a10=?
等差数列{an}中,a4+a10+a16=30,a10=?
有一叫生长豆的东西,泡在水里会变大,
发生类风湿关节炎的原因是:A、免疫监视功能异常 B、防御功能过高 C、自身稳定功能异常 D、失去防御能力
设P(B)>0,证明:P(A|B)≥P(A)
猜你喜欢
故乡的歌是—支清远的笛,总在有月亮的晚上响起.仿照上面句子,另写两个富有意蕴的句子.故乡的歌是…,…
数学几何的英语用语
清秋书简的思路.急用.
求潜入水下10米处的人受到的水的压强(g=10N/KM)
x-25%x=90
言来互相尊重,心至令人感动,日出万里无云,水到纯净透明
11. He is not so much _______ a help as I thought he would be. (A) of (B) in (C) at (D) as 难度:易
1 contraction of font and side parts as cells die off was observeed in some subjects in their thirties ,but it was still
© 2024 79432.Com All Rights Reserved.
电脑版
|
手机版