... P N V HNG DN CHM MễN TON Cõu Câu ỏp ỏn - Tp xỏc nh D = R \ { 1} < vi - S bin thi n y ' = ( x x 1) - x 1 + + Hm s nghch bin trờn mi khong -( ;1) , ( 1; + ) + Hm s khụng cú ... ) = +, lim y ( x ) = , suy ng- thng x = l ng2tim cn ng ca th x 1+ x Điểm 0,25 0,25 + Bng bin thi n 0,25 - th th nhn im I ( 1; ) lm tõm i xng 0,25 Tip tuyn song song d => TT cú h s gúc bng ... 10 (x + y + x + z)2 (2x + y + z)2 = 4 1 + ữ 3x + 2y + z + 3x + 2z + y + 3(2x + y + z) + T gi thit suy ra: 0,25 (2x + y + z)2 3(2x + y + z) + t 2x + y + z = t (t > 0) t2 (t 2)(3t + 8t +...