/// <summary>
        /// 四元数的积
        /// </summary>
        /// <param name="q1"></param>
        /// <param name="q2"></param>
        /// <returns></returns>
        public static StrQuaternions operator *(StrQuaternions q1, StrQuaternions q2)
        {
            StrQuaternions q = new StrQuaternions();

            q.T = "(" + q1.T + "*" + q2.T + "-" + q1.V * q2.V + ")";
            q.V = q1.T * q2.V + q2.T * q1.V + q1.V.XMultpy(q2.V);
            return(q);
        }
        /// <summary>
        /// 同除以一个实数
        /// </summary>
        /// <param name="q"></param>
        /// <param name="f"></param>
        /// <returns></returns>
        public static StrQuaternions operator /(StrQuaternions q, string f)
        {
            StrQuaternions t = new StrQuaternions();

            t.T = q.T + "/" + f;
            t.V = q.V / f;
            return(t);
        }
        /// <summary>
        /// 四元数的和
        /// </summary>
        /// <param name="q1"></param>
        /// <param name="q2"></param>
        /// <returns></returns>
        public static StrQuaternions operator +(StrQuaternions q1, StrQuaternions q2)
        {
            StrQuaternions q = new StrQuaternions();

            if (q1.T == "0")
            {
            }
            return(new StrQuaternions("(" + q1.T + "+" + q2.T + ")", q1.V + q2.V));
        }