>> MATLAB中Y=dsolve('int(sqrt(1+(Dy)^2=Dy*(1-x)+y))','y(0)=0,Dy(0)=0','x')哪里错了?

matlab中 y=dsolve('Dy+a*y=b','y(0)=y0') MATLAB中dsolve函数用法? >> MATLAB中Y=dsolve('int(sqrt(1+(Dy)^2=Dy*(1-x)+y))','y(0)=0,Dy(0)=0','x')哪里错了? 求各路大神指导,MATLAB中：利用dsolve求解偏微分方程 的解（用符号计算）.利用dsolve求解偏微分方程dx/dt=y,dy/dt=-x的解（用符号计算） Matlab求常微分方程为什么错误 dsolve('Dy=-2x*y/(x^2+2*a)')这个matlab提示：Error using ==> dsolve at 126Can not use D as a variable in DSOLVE. matlab用dsolve解常微分方程并画图,例如y'=1-y^2,y(0)=0. matlab小问题matlab中如果我想求解常微分问题,会用到dsolve,但是怎么保证我算的那个函数的变量与我想要的一致?比如如下程序应该是：soln_1 = dsolve('Dy =3*x^2','y(2)=0.5') ans=x^3-7.500000000000000 现在却 在matlab中求三元微分方程组的问题有如下语句:dsolve('Dx=-y-z','Dy=x+0.1*y','Dz=2+z*(x-4)')无法解出,为啥? matlab中想求出y=dsolve('D2y+y=sin(t) * cos(30)','t'),再画图,该怎么办?会出现Conversion to double from sym is not possible. matlab中求微分方程组通解dsolve('Dy=4*x-2*y','t','Dy=2*x-y','t')是错误的,那么,要怎么求关于t的通解呀? matlab解不了这个简单的微分方程dequ='D2y=-GM/(y^2)'y=dsolve(dequ,'y(0)=R0','t')运行结果：Warning:Explicit solution could not be found.> In dsolve at 101怎么回事? matlab 符号常微分y=dsolve('D2y-100*(1-y^2)*Dy=-y','y(0)=2,Dy(0)=0','x')哪里错了? y=dsolve('D2y=(-9.8sin(y))','t')用matlab怎么解出y的轨迹?就是y对t的二阶导加上9.8siny=0 matlab（1-x）*y''=0.2*sqrt(1+y'^2) 输入y=dsolve('(1-x)*D2y-0.2*sqrt(1+(Dy)^2)=0', matlab求解微分方程的答案出错求解的时候出现与题目无关的t,例如：y=dsolve('Dy=x')得 y =C2 + t*x 求教如何使用Matlab编程时解决微分方程中变量替换问题?x和y都是t的函数 x和y的关系为 x=2y-3dsolve('Dy=1/(x+y)','T(0)=0','t') 把微分方程中x由2y-3代入,解微分方程,得出y（t）然后根据 x和y的关系式,求 MATLAB中dsolve解出的t是什么含义?我使用了dsolve（’Dy = sin(pi*x*y)‘）；然后结果中：atan(2/(1+exp(2*t*pi*x+2*C1*pi*x))*exp(t*pi*x+C1*pi*x),-(exp(2*t*pi*x+2*C1*pi*x)-1)/(1+exp(2*t*pi*x+2*C1*pi*x)))/x/pi有t和c1两个量,c1想 matlab,解微分方程,[k,y]=dsolve('Dy=k*(y-28)','Dk=0','y(0)=30.8','y(60)=29.1','t')；k=simple(k)y=simple(y)[k,y]=dsolve('Dy=k*(y-28)','Dk=0','y(0)=30.8','y(60)=29.1','t')；|Error:Missing variable or function.