演習問題3.1

1.

次の連立微分方程式を解け．

(a)

$${ \left\{\begin{array}{rc} x_{1}^{\prime} =& x_{1} + 4x_{2}\\ x_{2}^{\prime} =& x_{1} + x_{2} \end{array} \right .}$$

(b)

$${ \left\{\begin{array}{rc} x_{1}^{\prime} =& 6x_{1} - 3x_{2}\\ x_{2}^{\prime} =& 2x_{1} + x_{2} \end{array} \right . }$$

(c)

$${ \left\{\begin{array}{rc} x_{1}^{\prime} =& x_{1} + x_{2} - x_{3}... ...{2}^{\prime} =& 2x_{2}\\ x_{3}^{\prime} =& x_{2} - x_{3} \end{array} \right .}$$

(d)

$${ {\bf X}^{\prime} = \left(\begin{array}{ccc} 1&-3&2\\ 0&-1&0\\ 0&-1&-2 \end{array}\right){\bf X} }$$

(e)

$${ \left\{\begin{array}{rc} x_{1}^{\prime} + x_{2}^{\prime} + 2x_{2} =& 0\\ x_{1}^{\prime} - 3x_{1} - 2x_{2} =& 0 \end{array} \right . }$$

(f)

$${ \left\{\begin{array}{rc} x_{1}^{\prime} + 6x_{1} + x_{2}^{\prime... ...{2} =& 0\\ x_{1}^{\prime} - x_{2}^{\prime} + x_{2} =& 0 \end{array} \right . }$$