Rút gọn căn thức sau \[A = \frac{{x\sqrt x + 26\sqrt x - 19}}{{x + 2\sqrt x - 3}} - \frac{{2\sqrt x }}{{\sqrt x - 1}} + \frac{{\sqrt x - 3}}{{\sqrt x + 3}}\,\,\,\left( {x \ge 0;\,\,\,x \ne 1} \right) % MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiFu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyqaiabg2 % da9maalaaabaGaamiEamaakaaabaGaamiEaaWcbeaakiabgUcaRiaa % ikdacaaI2aWaaOaaaeaacaWG4baaleqaaOGaeyOeI0IaaGymaiaaiM % daaeaacaWG4bGaey4kaSIaaGOmamaakaaabaGaamiEaaWcbeaakiab % gkHiTiaaiodaaaGaeyOeI0YaaSaaaeaacaaIYaWaaOaaaeaacaWG4b % aaleqaaaGcbaWaaOaaaeaacaWG4baaleqaaOGaeyOeI0IaaGymaaaa % cqGHRaWkdaWcaaqaamaakaaabaGaamiEaaWcbeaakiabgkHiTiaaio % daaeaadaGcaaqaaiaadIhaaSqabaGccqGHRaWkcaaIZaaaaiaaykW7 % caaMc8UaaGPaVpaabmaabaGaamiEaiabgwMiZkaaicdacaGG7aGaaG % PaVlaaykW7caaMc8UaamiEaiabgcMi5kaaigdaaiaawIcacaGLPaaa % aaa!63DA! \]