y(x) = -(1/6)*x^3+_C1*x+_C2
y''=-x==>dy'/dx=-x==>dy'=xdx==>y'=dy/dx=0.5x^2+C1;==》dy=0.5x^2dx+C1dx==>
y=(1/6)*x^3+C1*x*C2
有个问题,你的原式左边是不是d^2y/dx^2?就是y对x的二阶导数?
y(x) = -(1/6)*x^3+_C1*x+_C2
y''=-x==>dy'/dx=-x==>dy'=xdx==>y'=dy/dx=0.5x^2+C1;==》dy=0.5x^2dx+C1dx==>
y=(1/6)*x^3+C1*x*C2
有个问题,你的原式左边是不是d^2y/dx^2?就是y对x的二阶导数?