如果原式=(-1/3)x√(9x) + x^2√(1/x)=(-1/3)*3*x√x + x^2*x^(-1/2)=-x*x^(1/2) + x^(3/2)=-x(3/2) + x^(3/2)=0如果原式=-1/[3*x√(9x)]+x^2√(1/x)=-1/[3*3x√x]+x^2*x^(-1/2)=(-1/9)x^(-3/2)+x^(3/2)无法化简解毕...