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[最佳答案] Your solution is correct. Explanation: What you wrote is equivalent to: 0 < x < 1 0 < y < 1 0 < z < 1 0 < m < 1 a * a * a = m x * y * z = m 3 * a > x + y + z Z3 says this is unsatisfiable. Thus, if a^3 = xyz = m ( with a, x, y, z, m (0..1) ) then it cannot be the case that: 3a > (x+y+z) because, if this did occur, then the SMT problem you posed would be satisfiable, which would be a contradiction with the claim by Z3 that the SMT problem is unsatisfiable. If it can