[{"id": "mcm6l7", "text": "", "content": [{"type": "content/math", "position": 0, "content": "{2x}^2-{x}-3", "is_multiline": true}], "text_styles": [], "block_styles": []}, {"id": "ob1ns7", "text": "", "content": [{"type": "content/math", "position": 0, "content": "{4x}^2-{4x}+1", "is_multiline": true}], "text_styles": [], "block_styles": []}, {"id": "jg2nh8", "text": "", "content": [{"type": "content/math", "position": 0, "content": "{9x^2}+1", "is_multiline": true}], "text_styles": [], "block_styles": []}, {"id": "jfdjvk", "text": "", "content": [{"type": "content/math", "position": 0, "content": "{3x}^2-{2x}+1", "is_multiline": true}], "text_styles": [], "block_styles": []}] \text{Какой из приведенных квадратных трехчленов имеет два корня?}