A: dsolve('Df=x^2')
B: dsolve('Df==x^2')
C: dsolve('Df=x^2',x)
D: dsolve('Df==x^2',x)
举一反三
- 求微分方程[img=101x35]17da5f15503f795.png[/img] 的通解,实验命令为(). A: dsolve(Dy+2*x*y=x*exp(-x^2))ans=C1*exp(-x^2) + (x^2*exp(-x^2))/2 B: dsolve('Dy+2*x*y=x*exp(-x^2)','x')ans=C1*exp(-x^2) + (x^2*exp(-x^2))/2 C: dsolve('Dy+2*x*y=x*exp(-x^2)')ans=C1*exp(-x^2) + (x^2*exp(-x^2))/2
- 求解微分方程[img=203x35]17e443a63e2e7ec.png[/img]的通解的命令为： A: dsolve('(x^2-1)*Dy+2*x*y-sin(x)=0', 'x') B: dsolve('(x^2-1)*Dy+2*x*y-sin(x)=0') C: dsolve('(x^2-1)*Dy+2*x*y-sin(x)=0', 't') D: dsolve('(x^2-1)*Dy+2*x*y-sin(x)=0', 'y')
- 求解常微分方程初值问题[img=224x61]1803072f6b2a05a.png[/img]应用的语句是 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]
- 求解偏微分方程[img=178x28]18030731a73d552.png[/img], 应用的语句是 A: DSolve[(x^2+y^2)D[u,x]+x yD[u,y]==0,u,{x,y}] B: DSolve[(x^2+y^2)Dt[u[x,y],x]+xyDt[u[x,y],y]==0,u[x,y],{x,y}] C: DSolve[(x^2+y^2)D[u[x,y],x]+xyD[u[x,y],y]==0,u[x,y]] D: DSolve[(x^2+y^2)D[u[x,y],x]+xyD[u[x,y],y]==0,u[x,y],{x,y}]
- 求微分方程[img=143x21]17da5f14490e50e.png[/img]的通解,实验命令为(). A: dsolve(D2y-2*Dy+5*y=sin(2*x),x)ans =exp(x)*sin(2*x)*C2+exp(x)*cos(2*x)*C1+1/17*sin(2*x)+4/17*cos(2*x) B: dsolve('D2y-2*Dy+5*y=sin(2*x)','x')ans =cos(2*x)*(sin(4*x)/17 - cos(4*x)/68 + 1/4) - sin(2*x)*(cos(4*x)/17 + sin(4*x)/68) + C1*cos(2*x)*exp(x) - C2*sin(2*x)*exp(x) C: dsolve(D2y-2*Dy+5*y=sin(2*x),'x','y')ans =exp(x)*sin(2*x)*C2+exp(x)*cos(2*x)*C1+1/17*sin(2*x)+4/17*cos(2*x)
内容
- 0
如下命令可以计算微分方程[img=169x35]17e443a6601fbf7.png[/img]通解的是： A: dsolve('D2y-2*Dy+5*y-exp(x)*sin(x)=0','x') B: dsolve('DDy-2Dy+5*y-exp(x)*sin(x)=0','x') C: dsolve('D2y-2*Dy+5*y-exp(x)*sin(x)=0') D: dsolve('x','D2y-2*Dy+5*y-exp(x)*sin(x)=0')
- 1
MATLAB 中 dsolve 命令求解微分方程 y'+exy=1 时的正确格式为( )。 A: dsolve('Dy=1-exp(xy)','x') B: dsolve('Dy=1-exp(x*y)','x') C: dsolve('Du=1-exp(x*y)', 'x') D: dsolve(Dy=1-exp(x*y), 'x')
- 2
运行命令“y=dsolve('x*D2y-3*Dy=x^2','t')”求解微分方程，则______
- 3
通过命令[f,g]=dsolve(eq1,eq2,conds,v)求解微分方程组[img=455x26]1803b6b775ee66e.png[/img]时，下面设置正确的是 A: eq1='D2f+3*g=sin(x)' B: eq2='Dg+Df=cos(x)' C: conds='Df(2)=0,f(3)=3,g(5)=1' D: 以上都是
- 4
如下命令中不能实现如下微分方程组[img=327x203]17e443a5d83ce02.png[/img]，在初值条件[img=172x112]17e443a5e2ead01.png[/img]下的特解求解的是： A: [x,y] = dsolve('Dx+5*x+y = exp(t)', 'Dy-x-3*y=0', 'x(0)=1', 'y(0)=0', 't') B: [x,y] = dsolve('Dx+5*x+y = exp(t)', 'Dy-x-3*y=0', 'x(0)=1, y(0)=0', 't') C: [x,y] = dsolve('Dx+5*x+y = exp(t)', 'Dy-x-3*y=0', 'x(0)=1', 'y(0)=0') D: [x,y] = dsolve('Dx+5*x+y = exp(t)', 'Dy-x-3*y=0', 'x(0)=1', 'y(0)=0', 'x')