[图]的傅立叶级数展开式中，系数a3的值是：（）A. ['['πB....

A . 0 B . 1 C . -1 D . 1／2

A . 相位 B . 周期 C . 振幅 D . 频率

A . =AVERAGE（A1：A4） B . =AVERAGE（A1、A2、A3、A4） C . =AVERAGE（A1+A2+A4+A4） D . =（A1，A4）/4

A . ['['πB . 1／10π（-1+）https://assets.asklib.com/psource/2015102616370717083.jpg C . 1／10π（1+https://assets.asklib.com/psource/2015102616370717083.jpg ）D . 1／10π（1-https://assets.asklib.com/psource/2015102616370717083.jpg ）

A . ['['πB .https://assets.asklib.com/psource/2015103008585554893.jpg C .https://assets.asklib.com/psource/2015103008591052451.jpg D .https://assets.asklib.com/psource/2015103008592693307.jpg

A . A.不能 B . B.能 C . C.不确定

A . 3 B . 2 C . 4 D . 1

<img src='https://img2.soutiyun.com/ask/2020-12-22/977479103761578.png' />

<img src='https://img2.soutiyun.com/shangxueba/ask/17670001-17673000/17670728/2015102617230517029.jpg' />的值是：（） A. ['2 B. 0 C. 1／2<img src='https://img2.soutiyun.com/shangxueba/ask/17670001-17673000/17670728/2015102617231798987.jpg' /> D. 1／4<img src='https://img2.soutiyun.com/shangxueba/ask/17670001-17673000/17670728/2015102617231798987.jpg' />

函数<img src='https://img2.soutiyun.com/shangxueba/ask/17670001-17673000/17671257/2015102914165070741.jpg' />在x=2处的泰勒级数展开式为（）． A．<img src='https://img2.soutiyun.com/shangxueba/ask/17670001-17673000/17671257/2015102914171256962.jpg' /> B．<img src='https://img2.soutiyun.com/shangxueba/ask/17670001-17673000/17671257/2015102914172646978.jpg' /> C．<img src='https://img2.soutiyun.com/shangxueba/ask/17670001-17673000/17671257/2015102914174241489.jpg' /> D．<img src='https://img2.soutiyun.com/shangxueba/ask/17670001-17673000/17671257/2015102914180033916.jpg' />

将函数<img src='https://img2.soutiyun.com/shangxueba/ask/18747001-18750000/18749367/2016071617013646896.jpg' />，在［-π，π］上展开成傅里叶级数，其形式为<img src='https://img2.soutiyun.com/shangxueba/ask/18747001-18750000/18749367/2016071617014226431.jpg' />（）<img src='https://img2.soutiyun.com/shangxueba/ask/18747001-18750000/18749367/2016071617014996704.jpg' /> A．A B． B C． C D． D

A. =AVERAGE(A1+A2+A3+A4) B. =AVERAGE(A1:A4) C. =AVERAGE(A1,A2,A3,A4) D. =(A1+A2+A3+A4)/4

相对编号常用于()中。 A.安装接线图 B.屏面布置图 C.归总式原理图 D.展开式原理图

设函数<img src='https://img2.soutiyun.com/shangxueba/ask/19011001-19014000/19013158/2015110315195516320.png' />，要使f（x）在x=0处连续，则a的值是：（） A．0 B． 1 C． -1 D． λ

<img src='https://img2.soutiyun.com/shangxueba/ask/17667001-17670000/17668374/2015102617295182065.jpg' />（x+e^x）<img src='https://img2.soutiyun.com/shangxueba/ask/17667001-17670000/17668374/2015102617295341130.jpg' />的值是：（） A．e B． e C． 1 D． 2

（1）求<img src='https://img2.soutiyun.com/shangxueba/ask/17817001-17820000/17817466/2016030217251173598.jpg' />的展开式中x⁴的系数： （2）求<img src='https://img2.soutiyun.com/shangxueba/ask/17817001-17820000/17817466/2016030217251291523.jpg' />的展开式中的常数项： （3）求<img src='https://img2.soutiyun.com/shangxueba/ask/17817001-17820000/17817466/2016030217251492432.jpg' />的展开式中x³的系数。