回复: 求用MATLAB求解二阶微分方程组的算法
补充化解：
>> pretty(x5)
1/2 sin(8 t) + C1 exp(RootOf(%1, index = 1) t)
+ C2 exp(RootOf(%1, index = 2) t) + C3 exp(RootOf(%1, index = 3) t)
+ C4 exp(RootOf(%1, index = 4) t)
4 3 2
%1 := 129 _Z + 982500 _Z + 1945000 _Z + 150000000 _Z + 100000000
>> pretty(xu)
1473621 2
- --------- C1 RootOf(%1, index = 1) exp(RootOf(%1, index = 1) t)
225010000
1473621 2
- --------- C2 RootOf(%1, index = 2) exp(RootOf(%1, index = 2) t)
225010000
1473621 2
- --------- C3 RootOf(%1, index = 3) exp(RootOf(%1, index = 3) t)
225010000
1473621 2
- --------- C4 RootOf(%1, index = 4) exp(RootOf(%1, index = 4) t)
225010000
+ 1/2 sin(8 t)
387 3
- --------- C1 RootOf(%1, index = 1) exp(RootOf(%1, index = 1) t)
450020000
387 3
- --------- C2 RootOf(%1, index = 2) exp(RootOf(%1, index = 2) t)
450020000
387 3
- --------- C3 RootOf(%1, index = 3) exp(RootOf(%1, index = 3) t)
450020000
387 3
- --------- C4 RootOf(%1, index = 4) exp(RootOf(%1, index = 4) t)
450020000
+ 1/22501 C1 exp(RootOf(%1, index = 1) t)
+ 1/22501 C2 exp(RootOf(%1, index = 2) t)
+ 1/22501 C3 exp(RootOf(%1, index = 3) t)
+ 1/22501 C4 exp(RootOf(%1, index = 4) t)
4 3 2
%1 := 129 _Z + 982500 _Z + 1945000 _Z + 150000000 _Z + 100000000
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