//.....................................................................
        /// <summary>
        ///
        /// </summary>
        /// <returns></returns>
        private OpxM.Denominator mathDenom_2_A( )
        {
            OpxM.Denominator denominator1 = new OpxM.Denominator( );

            OpxM.Run run10 = mathNumP002( );
            OpxM.Run run11 = mathA( );

            denominator1.Append(OpenDocxMathExprs.MakeMathRun("2a"));
            denominator1.Append(run11);

            return(denominator1);
        }
        //.....................................................................
        /// <summary>
        /// 使用常规的字符串生成一个分式(标准的、上下格式)
        /// </summary>
        /// <param name="upper"></param>
        /// <param name="lower"></param>
        /// <returns></returns>
        public static M.Fraction MakeFraction(string upper, string lower)
        {
            M.Fraction fraction = new M.Fraction( );

            M.Numerator upperNUM = new M.Numerator( );
            upperNUM.Append(OpenDocxMathExprs.MakeMathRun(upper));

            M.Denominator lowerDEN = new M.Denominator( );
            lowerDEN.Append(OpenDocxMathExprs.MakeMathRun(lower));

            fraction.Append(OpenDocxMathExprs.MakeFractionProperties( ));
            fraction.Append(upperNUM);
            fraction.Append(lowerDEN);

            return(fraction);
        }
        //.....................................................................
        /// <summary>
        ///
        /// </summary>
        /// <param name="upper"></param>
        /// <param name="lower"></param>
        /// <returns></returns>
        public static M.Fraction MakeFraction(OpenXmlElement upper, OpenXmlElement lower)
        {
            M.Fraction fraction = new M.Fraction( );

            M.Numerator upperNUM = new M.Numerator( );
            upperNUM.Append(upper);

            M.Denominator lowerDEN = new M.Denominator( );
            lowerDEN.Append(lower);

            fraction.Append(OpenDocxMathExprs.MakeFractionProperties( ));
            fraction.Append(upperNUM);
            fraction.Append(lowerDEN);

            return(fraction);
        }