[{"id": "uj6kts", "text": "", "content": [{"type": "content/math", "position": 0, "content": "5{x}^2-x+1", "is_multiline": true}], "text_styles": [], "block_styles": []}, {"id": "ahmpgo", "text": "", "content": [{"type": "content/math", "position": 0, "content": "{x^2}+4{x}+3", "is_multiline": true}], "text_styles": [], "block_styles": []}, {"id": "g905qx", "text": "", "content": [{"type": "content/math", "position": 0, "content": "{9x^2}-{6x}+1", "is_multiline": true}], "text_styles": [], "block_styles": []}, {"id": "76b5qf", "text": "", "content": [{"type": "content/math", "position": 0, "content": "{2x^2}-{x}", "is_multiline": true}], "text_styles": [], "block_styles": []}] \text{Какой из приведенных квадратных трехчленов не имеет корней?}