public static PhepToan getCongThuc(PhepToan giatri) { string ct = giatri.Congthuc.Trim(); string[] items = ct.Split(new Char[] { '-', '+', 'x', ':' }); string tm = ""; if (ct.Contains("+")) { tm = ClsLanguage.doTong(); } else if (ct.Contains("-")) { tm = ClsLanguage.doHieu(); } else if (ct.Contains("x")) { tm = ClsLanguage.doNhan(); } else if (ct.Contains(":")) { tm = ClsLanguage.doChia(); } if (tm.Trim().Equals("")) { return(new PhepToan("" + giatri.Congthuc, giatri.Ketqua, "number")); } else { return(new PhepToan(tm + items[0] + ClsLanguage.doAnd() + items[1], giatri.Ketqua, "number")); } }