方程的解为80b3d1016e4d4c26837b1df935802fba.png

A . y=C +C x+C e +C e B . y=C cosx+C sinx+C x+C C . y=C +C X+C e +C e D . y=C e +C e +C cosx+C sinx

A .https://assets.asklib.com/images/image2/2017051115262332611.png B .https://assets.asklib.com/images/image2/201705111526331392.png C .https://assets.asklib.com/images/image2/2017051115263940123.png D .https://assets.asklib.com/images/image2/2017051115264827726.png

A . y=C1lnx+C2 B . y=C1lnx+C2X C . y=C（lnx+1） D . y=C（lnx+x）

A .https://assets.asklib.com/images/image2/2017051116494035677.png B .https://assets.asklib.com/images/image2/2017051116495112762.png C .https://assets.asklib.com/images/image2/2017051116500435859.png D .https://assets.asklib.com/images/image2/2017051116501460302.png

A . y=C e +C e B . y=e （C +C x） C . y=C e +C e D . y=C e +C e

A . A、节点流量 B . B、节点水压 C . C、管段流量 D . D、沿线流量

A . y=sinx+cosx+C x+C B . y=-sinx-cosx+C x+C C . y=sinx-cosx+C x+C D . y=-sinx+cosx+C x+

A . 正确 B . 错误

A . 整数 B . 正数 C . 分数 D . 不一定

A．y=e^x+e^-x B．y=e^x-e^-x C．y=C₁e^x+C₂e^-x D．y=C₁e^2x+C₂e^-2x

微分方程y&quot;+2y&amp;39;+3y=0的通解为（） <img src='https://img2.soutiyun.com/ask/uploadfile/9711001-9714000/c4f899776b5c0f64cf7b4297dd6530e9.png' />

通解为<img src='https://img2.soutiyun.com/ask/2020-12-13/976736211521491.png' />的二阶线性齐次微分方程为().

线性方程Ax=B的解为x=A^-3B，(A B)经行变换可得到(E A^-1B)，矩阵方程xA=B的解为x=BA^-1，<img src='https://img2.soutiyun.com/ask/2020-11-26/975229836735006.png' />经列变换得到<img src='https://img2.soutiyun.com/ask/2020-11-26/975229847362615.png' />利用初等变换解矩阵方程。 <img src='https://img2.soutiyun.com/ask/2020-11-26/975229871904018.png' />

A.sinx+C1x+C2 B.sinx+C1+C2 C.-sinx+C1x+C2 D.-sinx+C1+C2

微分方程y&quot;+4y&amp;39;+4y=0的通解为() <img src='https://img2.soutiyun.com/ask/uploadfile/9819001-9822000/0114f033e5fd1ce4fe144720818b3399.png' />

设m×n矩阵A的秩为R(A)-n-1， 且<img src='https://img2.soutiyun.com/ask/2020-12-17/977050765391984.png' />是齐次方程Ax=0的两个不同的解，则Ax=0的通解为() A.<img src='https://img2.soutiyun.com/ask/2020-12-17/977050784779092.png' /> B.<img src='https://img2.soutiyun.com/ask/2020-12-17/977050796368755.png' /> C.<img src='https://img2.soutiyun.com/ask/2020-12-17/977050810153544.png' /> D.<img src='https://img2.soutiyun.com/ask/2020-12-17/977050823541309.png' />

是 否

A．i B．i或-i C．-i D．√-i

A．y=cos(x+c1)+c2 B．y=sin(x+c1)+c2 C．y=-In|cos(x+c1)|+c2 D．y=-In|sin(x+c1)|+c2