亥姆霍兹方程<img src='https://img2.soutiyun.com/ask/2020-01-08/94732463546788.png' />对下列哪种情况成立( )
能量方程中<img src='https://img2.soutiyun.com/latex/latex.action' />表示( )。
微分方程<img src='https://img2.soutiyun.com/ask/2020-02-15/950615032354502.png' />的通解为( )。
电极反应<img src='https://img2.soutiyun.com/latex/latex.action' />的能斯特方程式为()。
1．微分方程<img src='https://img2.soutiyun.com/ask/2020-03-09/952636097163919.png' />是( )．
实验测得化学反应<img src='https://img2.soutiyun.com/ask/2020-03-05/952259955284323.png' />的速率方程为<img src='https://img2.soutiyun.com/ask/2020-03-05/95225996394296.png' />，根据上述条件可以认为( )
电磁波波动方程<img src='https://img2.soutiyun.com/ask/2020-01-08/947325610118107.png' />只有在下列哪种情况下才成立( )
作变量代换x=Int简化方程<img src='https://img2.soutiyun.com/ask/2021-01-13/979381219766245.png' />
试证明下列函数满足拉普拉斯方程：<img src='https://img2.soutiyun.com/ask/2019-06-18/929711665151155.png' />
设X～N(μ，σ<sup>2</sup>)，σ＞0，二次方程<img src='https://img2.soutiyun.com/latex/latex.action' />无实根的概率为<img src='https://img2.soutiyun.com/latex/latex.action' />，则μ=( )
某校通过调查、计算，建立了考试成绩倚学习时间的直线回归方程：<img src='https://img2.soutiyun.com/ask/2020-03-10/95272365711637.png' />=180-5x，该方程明显有误，错误在于( )。
<img src='https://img2.soutiyun.com/latex/latex.action' />的特征方程为( )
曲线<img src='https://img2.soutiyun.com/ask/2020-03-11/952816359188393.png' />的水平渐近线方程为( )。
解方程：<img src='https://img2.soutiyun.com/ask/2021-03-04/983702960447469.png' />
求下列参数方程所确定的函数的三阶导数<img src='https://img2.soutiyun.com/ask/2020-08-06/965553991550217.png' />
已知微分方程<img src='https://img2.soutiyun.com/shangxueba/ask/17664001-17667000/17666030/2015102914210098816.jpg' />的一个特解为<img src='https://img2.soutiyun.com/shangxueba/ask/17664001-17667000/17666030/2015102914210098816.jpg' />，则此微分方程的通解是（）．
在力法方程<img src='https://img2.soutiyun.com/shangxueba/ask/18747001-18750000/18749360/2016071809192433999.jpg' />中，下列结论肯定出现的是：（）
设矩阵满足方程<img src='https://img2.soutiyun.com/ask/uploadfile/10923001-10926000/62839ccf0758320892b8a63233c10674.jpg' />
设函数<img src='https://img2.soutiyun.com/shangxueba/ask/51060001-51063000/51061013/970054070213009.png' />求方程f(x)=0的根。
过点M（3，-2，1）且与直线<img src='https://img2.soutiyun.com/shangxueba/ask/18729001-18732000/18730661/2016071514231735481.jpg' />平行的直线方程为（）<img src='https://img2.soutiyun.com/shangxueba/ask/18729001-18732000/18730661/2016071514234648431.jpg' />
过点（4，-1，3）且平行于直线<img src='https://img2.soutiyun.com/shangxueba/ask/17661001-17664000/17663979/2015102914564543541.jpg' />的直线方程为（）．
设<img src='https://img2.soutiyun.com/shangxueba/ask/51291001-51294000/51293683/975264374908477.png' />是n维实向量,且<img src='https://img2.soutiyun.com/shangxueba/ask/51291001-51294000/51293683/975264387229182.png' />战性无关,<img src='https://img2.soutiyun.com/shangxueba/ask/51291001-51294000/51293683/975264401121976.png' /><img src='https://img2.soutiyun.com/shangxueba/ask/51291001-51294000/51293683/975264415373792.png' />是线性方程组
已知齐次线性方程<img src='https://img2.soutiyun.com/shangxueba/ask/19020001-19023000/19020937/2015110116061593238.png' />有非零解，则常数λ可取为（）
求解差分方程:<img src='https://img2.soutiyun.com/ask/2020-12-17/977053448502449.png' />
