已知，求，并求的周期卷积。

A . 经济快速增长 B . 开采已到颠峰 C . 利润低 D . 资源缺乏

A . K B . F C . E D . Z

D、 D. 孔隙比

A . 运行周期 B . 维护成本 C . 生产功效 D . 及时交货

<img src='https://img2.soutiyun.com/ask/2021-01-15/979578362875783.png' />

求函数f(x)=<img src='https://img2.soutiyun.com/ask/2020-11-10/973854762775122.png' />的连续区间,并求极限<img src='https://img2.soutiyun.com/ask/2020-11-10/97385478004011.png' />

讨论函数f(x)<img src='https://img2.soutiyun.com/ask/2020-10-27/972682503904635.png' />在哪些区间内连续,并求极限<img src='https://img2.soutiyun.com/ask/2020-10-27/972682524165794.png' />

设<img src='https://img2.soutiyun.com/ask/2020-12-15/976895300573634.png' />,<img src='https://img2.soutiyun.com/ask/2020-12-15/976895311426255.png' />,证明:<img src='https://img2.soutiyun.com/ask/2020-12-15/976895323305934.png' />;并求下列极限: <img src='https://img2.soutiyun.com/ask/2020-12-15/976895333998546.png' />

设矩阵<img src='https://img2.soutiyun.com/ask/2020-12-21/977394752005442.png' />，已知矩阵A有三个线性无关的特征向量，λ=2是矩阵A的二重特征值，试求x与y的值，并求可逆矩阵P，使P^-1AP成为对角矩阵。

已知函数f(x)=3^x在点x=0,1,-1,2,-2处的值，用埃尔金算法求<img src='https://img2.soutiyun.com/ask/2020-08-11/965985526860802.png' />的近似值。

求幂级数<img src='https://img2.soutiyun.com/ask/2020-12-11/976533602465549.png' />的收敛域及和函数,并求常数项级数<img src='https://img2.soutiyun.com/ask/2020-12-11/976533633968351.png' />的和.

A．本级机构经营能力 B．国内市场供求情况 C．市场占有率 D．未来市场需求前景

<img src='https://img2.soutiyun.com/ask/2020-12-17/97704804646547.png' />

<img src='https://img2.soutiyun.com/ask/2020-08-17/966501771982488.png' />

<img src='https://img2.soutiyun.com/ask/2020-07-10/963220678048646.png' />