[ych3100]

uh1=(1-c111*xi^3*yi-c121*xi*yi^3)*lani^3+(-c111*xj^3*yj-c121*xj*yj^3)*lanj^3+(-c111*xk^3*yk-c121*xk*yk^3)*lank^3；我想把此多项式以 c111和c121 重新整理怎么办？
谢谢1！！