对任意变量求解 r=solve(z, b) (a 2+c)/t r =solve(z c a*^2-b米t r=solve(z, a) (b*t+c)2对任意变量求解 r =solve(z,'b') r = -(a*t^2+c)/t r =solve(z,'c') r = -a*t^2-b*t r =solve(z,'a') r = -(b*t+c)/t^2