已知,当 $x$ $\rightarrow$ $0$ 时:
$$
(1+x)^{a} – 1 \sim ax
$$
已知,当 $x$ $\rightarrow$ $0$ 时:
$$
(1+x)^{a} – 1 \sim ax
$$
$\left|\begin{array}{lll} a_{11}+b_{11} & a_{12} & a_{13} \\ a_{21}+b_{21} & a_{22} & a_{23} \\ a_{31}+b_{31} & a_{32} & a_{33} \end{array}\right|$.
则,根据行列式的性质,可以对上面的行列式做什么样的转换?
$\left|\begin{array}{lll} \textcolor{Red}{a_{11}} \textcolor{yellow}{+} \textcolor{cyan}{b_{11}} & a_{12} & a_{13} \\ \textcolor{Red}{a_{21}} \textcolor{yellow}{+} \textcolor{cyan}{b_{21}} & a_{22} & a_{23} \\ \textcolor{Red}{a_{31}} \textcolor{yellow}{+} \textcolor{cyan}{b_{31}} & a_{32} & a_{33} \end{array}\right|$ $=$ $\left|\begin{array}{lll} \textcolor{Red}{a_{11}} & a_{12} & a_{13} \\ \textcolor{Red}{a_{21}} & a_{22} & a_{23} \\ \textcolor{Red}{a_{31}} & a_{32} & a_{33} \end{array}\right|$ $\textcolor{yellow}{+}$ $\left|\begin{array}{lll} \textcolor{cyan}{b_{11}} & a_{12} & a_{13} \\ \textcolor{cyan}{b_{21}} & a_{22} & a_{23} \\ \textcolor{cyan}{b_{31}} & a_{32} & a_{33}\end{array}\right|$
$\left|\begin{array}{cccc} a_{11} & a_{12} & \cdots & a_{1 n} \\ \cdots & \cdots & \cdots & \cdots \\ \textcolor{red}{k} a_{i 1} & \textcolor{red}{k} a_{i 2} & \cdots & \textcolor{red}{k} a_{i n} \\ \cdots & \cdots & \cdots & \cdots \\ a_{n 1} & a_{n 2} & \cdots & a_{n n} \end{array}\right|$ $=$ $\textcolor{red}{k}$ $\left|\begin{array}{cccc} a_{11} & a_{12} & \cdots & a_{1 n} \\ \cdots & \cdots & \cdots & \cdots \\ a_{i 1} & a_{i 2} & \cdots & a_{i n} \\ \cdots & \cdots & \cdots & \cdots \\ a_{n 1} & a_{n 2} & \cdots & a_{n n}\end{array}\right|$
其中,非齐次项 $f(t)$ $=$ $f(t)$ $=$ $d^{t}$ $\cdot$ $P_{m}(t)$, 其中,$d$ 为非零常数,$P_{m}(t)$ $=$ $b_{0}$ $+$ $b_{1}$ $t$ $+$ $\cdots$ $+$ $b_{m}$ $t^{m}$
且:$a$ $+$ $d$ $\neq$ $0$.
则,试取特解的形式 $y_{t}^{*}$ $=$ $?$
其中,非齐次项 $f(t)$ $=$ $f(t)$ $=$ $d^{t}$ $\cdot$ $P_{m}(t)$, 其中,$d$ 为非零常数,$P_{m}(t)$ $=$ $b_{0}$ $+$ $b_{1}$ $t$ $+$ $\cdots$ $+$ $b_{m}$ $t^{m}$
且:$a$ $+$ $d$ $\neq$ $0$.
则,试取特解的形式 $y_{t}^{*}$ $=$ $?$
其中,非齐次项 $f(t)$ $=$ $P_{m}(t)$ $=$ $b_{0}$ $+$ $b_{1}$ $t$ $+$ $\cdots$ $+$ $b_{m}$ $t^{m}$
且:$a$ $=$ $-1$.
则,试取特解的形式 $y_{t}^{*}$ $=$ $?$
其中,非齐次项 $f(t)$ $=$ $P_{m}(t)$ $=$ $b_{0}$ $+$ $b_{1}$ $t$ $+$ $\cdots$ $+$ $b_{m}$ $t^{m}$
且:$a$ $\neq$ $-1$.
则,试取特解的形式 $y_{t}^{*}$ $=$ $?$