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大哥救命啊 2008-04-18 20:37

[求助]以知方程组,求解(好难,求助)
 
[FONT="黑体"][SIZE="5"][/SIZE][/FONT]
X1(s)=G1(s)*R(s)-G1(s)*[G7(s)-G8(s)]C(s)
X2(s)=G2(s)[X1(S)-G6(s)*X3(s)]
X3(s)=[X2(s)-C(s)*G5(s)]*G3(s)
C(s)=G4(s)X3(s)
求出C(s)/R(s)


所有时间均为北京时间。现在的时间是 03:00

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