2.求解下列常系数线性微分方程:-|||-(1) ^(4)-5(x)^n+4x=0;-|||-(2) ^m-3a(x)^n+3(a)^2(x)^1-(a)^3x=0;-|||-(3) ^(5)-4(x)^m=0;-|||-(4) ''+x'+x=0;-|||-(5) ''-(a)^2s=t+1 ;-|||-(6) ^m-4x''+5x'-2x=2t+3;-|||-(7) ^(4)-2(x)^n+x=(t)^2-3;-|||-(8) ^m-x=cos t;-|||-(9) ''+x'-2x=8sin 2t;-|||-(10) ^m-x=(e)^t;-|||-(11) ''+2as'+(a)^2s=(e)^t;-|||-(12) ''+6x'+5x=(e)^2t;-|||-(13) ''-2x'+3x=(e)^-tcos t;-|||-(14) ''+x=sin t-cos 2t;-|||-(15) ''-4x'+4x=(e)^t+(e)^2t+1;-|||-(16) ''+9x=tsin 3t;-|||-(17) ''-2x'+2x=t(e)^tcos t;-|||-(18) ''+2x'+5x=4(e)^-t+17sin 2t;-|||-(19) ''+x=dfrac (1)({sin )^3t};-|||-(20) ''+x=1-dfrac (1)(sin t)

2.求解下列常系数线性微分方程:-|||-(1) ^(4)-5x+4x=0-|||-(2) ^m-3a(x)^n+3(a)^2(x)^1-(a)^3x=0;-|

解下列方程：(1)x2+x=0；(2)x2-2√3x=0；(3)3x2-6x=-3；(4)4x2-121=0；(5)3x(2x+1)=4x+2；(6)(x-4)

13.求解下列齐次线性方程组:-|||-(1) ) (x)_(1)+(x)_(2)+2(x)_(3)-(x)_(4)=0, 2(x)_(1)+(x)_(2)

13.求解下列齐次线性方程组:-|||-(1) ) (x)_(1)+(x)_(2)+2(x)_(3)-(x)_(4)=0, 2(x)_(1)+(x)_(2)

6.求解下列齐次线性方程组.-|||-(1) ) (x)_(1)+(x)_(2)+2(x)_(3)-(x)_(4)=0, 2(x)_(1)+(x)_(2)+

用消元法解下列线性方程组:-|||- x1+3x2+5x3-4x4 =1, x1+3x2+2x3-2x4+x5=-1, x1-2x2+x3-x4-x5=3, x

求线性方程组_(1)+(x)_(2)+(x)_(3)+(x)_(4)=0-|||-_(2)+2(x)_(3)+2(x)_(4)=1-|||-_(1)+2(x)_

3.求解线性方程组 ) (x)_(1)+2(x)_(2)-(x)_(3)+2(x)_(4)=1 2(x)_(1)+4(x)_(2)+(x)_(3)+(x)_(

求解下列齐次线性方程组-|||- ) (x)_(1)+2(x)_(2)-(x)_(3)+(x)_(4)=1 2(x)_(1)+4(x)_(2)-2(x)_(3

5、求解下列方程。-|||-(1) ^4-3(x)^2+2=0;-|||-(2) ^4-3(x)^2-4=0;-|||-(3) ^2x-(e+1)(e)^x+e