user-avatar
c2yenthinh.pgdchodon
2 năm trước
Chứng minh: a. x ² + x + 1 > 0 b. (x - 3)(x - 5) + 2 > 0 c. x ² + y ² + 2xy + 4 > 0 d. 4x - 10 - x ² < 0 e. -x ² + 4x - 5 < 0 f. x ² + 2x + y ² + 1 ≥ 0 g. 4( x - 2 )( x - 1 )( x + 4 )( x + 8 ) +25x ² ≥ 0 giúp vwois ạ plsssss
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

70. I haven't been able to see them for over a year. It is 71. It stared to rain at 2 o'clock. It has 72. I have never been to the ballet before. It is 73. John and Mary moved to Edinburgh twenty years ago. It is 74. The police started looking for him two months ago. For two months now the 75. I have never seen a dirtier-looking dog. This is 76. Mary rang hours and hours ago. It it hours 77. It is ages since Alan visited his parents. Alan 78. John has not had his hair cut for over six months. It is 79. I has never seen such a beautiful building. It's the most 80. I have never read such a romantic story. This is the most 81. They had never had such a cold winter. It was the 82. You will never meet anyone more dangerous than Mrs Jones. Mr. Jones is the most 83. Man has never had such efficient servants as computer. Computer is the most 84. I haven't played football since 2000. The last time 85. I haven't been to HCM city for 2 years. The last time 86. I 've never met such a famous person before. It is the first time 87. She hasn't seen that boy here before. It is the first 88. She hasn't written to us since last year. The last time 89. She started to learn E 8 years ago. It’s 90 He hasn't laughed so much for ages. It’s 91 I haven't enjoyed myself so much for years. It’s 92 The telephone rang for hours. It’s hours 93 I haven't seen him for ages. It’s 94I have learned English for four years. We started 105 Ly’s father started to stop smoking last year. Ly’s father 106 The editor hasn’t written to Mai for a month. The editor last 107 How long have you learned spanish? How long ago

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team