解下列不定方程

A . y″+y′-2y=2+e B . y″-y′-2y=4x+2e C . y″-2y′+y=x+e D . y″-2y′=4+2e

A . 正确 B . 错误

A .https://assets.asklib.com/psource/2015102914291712200.jpg 也是Ax=0的基础解系B .https://assets.asklib.com/psource/2015102914293459651.jpg 是Ax=0的通解C .https://assets.asklib.com/psource/2015102914295216675.jpg 是Ax=0的通解D .https://assets.asklib.com/psource/2015102914300620685.jpg 也是Ax=0的基础解系

A．α1－α2，α2－α3，α3－α4,α4－α1 B．α1＋α2，α2＋α3，α3＋α4，α4＋α1 C．α1，α1＋α2，α1＋α2＋α3，α1＋α2＋α3＋α4 D．α1＋α2，α2＋α3，α3－α4，α4－α1

<img src='https://img2.soutiyun.com/ask/2020-07-27/964691115327238.png' />

<img src='https://img2.soutiyun.com/ask/2020-12-13/97673476003247.png' />

设A是m×n阶矩阵，下列命题正确的是()． A．若方程组AX=0只有零解，则方程组AX＝b有唯一解 B．若方程组AX=0有非零解，则方程组AX＝b有无穷多个解 C．若方程组AX＝b无解，则方程组Ax＝0一定有非零解 D．若方程组AX＝b有无穷多个解，则方程组AX＝0一定有非零解

<img src='https://img2.soutiyun.com/ask/2020-08-14/9662677315935.png' /> <img src='https://img2.soutiyun.com/ask/2020-08-14/96626774435223.png' />

解下列矩阵方程组<img src='https://img2.soutiyun.com/ask/2020-10-23/972291380802454.png' />其中<img src='https://img2.soutiyun.com/ask/2020-10-23/972291400162562.png' />

<img src='https://img2.soutiyun.com/ask/2021-01-02/97846636593626.png' />

<img src='https://img2.soutiyun.com/ask/2020-08-04/965396362931158.png' />

<img src='https://img2.soutiyun.com/ask/2020-07-24/96444759116991.png' />

<img src='https://img2.soutiyun.com/ask/2020-08-11/965983115282868.png' />

<img src='https://img2.soutiyun.com/ask/2020-07-27/96470850533889.png' />

A．ode23 B．ode34 C．ode45 D．ode113

<img src='https://img2.soutiyun.com/ask/2020-12-13/976736995843352.png' />