?3x1?x2?5x4?2x?2x?3x?11?123?6x?7x?3x?4?234（1）?2x1?2x2?5x3?12 （2）? ?4x2?33?7?3x?5x?x?31?23?1??2x1?x2?2x3?6x4?8
3通过测量的一组数据 t 1
2
3
4
5
6
7
8
9
10
y 4.842 4.362 3.754 3.368 3.169 3.083 3.034 3.016 3.012 3.005 分别采用y1?t??c1?c2e?t和y2?t??d1?d2te?t进行拟合，并画出拟合曲线进行对比。
5．求解下列线性微分方程，并画出状态轨迹。
??x1??x1?2x2?3x3?x4?5x?5x?6x?x1231?????3x1?x3?2x4?x2（1）? ?3x1?2x2?5x3?x2 （2）????x1?2x2?5x4?x3?2x?x?4x?x233??1????2x1?3x2?x4?x4? X(0)=[1 -4 5]’ X(0)=[1 -1 2 1]’ (1)
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