A.DSolve[2y[x]y"[x]==1+(y'[x])^2,y[0]==1,y'[0]==0,y[x],x
B.DSolve[{2y[x]y" [x]==1+(y'[x])^2,y[0]==1,y'[0]==0},y[x],x]
C.DSolve[{2y[x]y" [x]==1+(y^' [x])^2;y[0]==1;y'[0]==0},y[x],x]
D.DSolve[{2yy"==1+(y^' )^2&&y[0]==1&&y'[0]==0},y[x],x]
A.DSolve[2y[x]y"[x]==1+(y'[x])^2,y[0]==1,y'[0]==0,y[x],x
B.DSolve[{2y[x]y" [x]==1+(y'[x])^2,y[0]==1,y'[0]==0},y[x],x]
C.DSolve[{2y[x]y" [x]==1+(y^' [x])^2;y[0]==1;y'[0]==0},y[x],x]
D.DSolve[{2yy"==1+(y^' )^2&&y[0]==1&&y'[0]==0},y[x],x]
A.DSolve[2y[x]y"[x]==1+(y'[x])^2,y[0]==1,y'[0]==0,y[x],x
B.DSolve[{2y[x]y" [x]==1+(y'[x])^2,y[0]==1,y'[0]==0},y[x],x]
C.DSolve[{2y[x]y" [x]==1+(y^' [x])^2;y[0]==1;y'[0]==0},y[x],x]
D.DSolve[{2yy"==1+(y^' )^2&&y[0]==1&&y'[0]==0},y[x],x]
指出下列各题中的函数是否为所给微分方程的解:y"=(λ1+λ2)y'+λ1+λ2y=0,y=C1eλ1x+C2eλ2x.
一线性时不变连续时间因果系统的微分方程描述为:
y' ' (t)+3y' (t)+2y(t)=5f' (t)+4f(t),t>0。
输入f(t)=e-3tε(t),初始状态y(0-)=2,y' (0-)=1,试由S域求:
(1)系统的零输入响应yx(t)和零输入响应yf(t);
(2)系统函数H(s),单位冲激响应h(t),并判断系统是否稳定;
(3)若输入信号为f(t)=e-3te(1-2),重求(1)、(2)。
A.0
B.3
C.2
D.1
A.0
B.1
C.2
D.3
A.3
B.2
C.1
D.0
A.0
B.1
C.2
D.3
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