{"ok":true,"question":{"id":21223,"question_uuid":"1fcb158c-0f65-4ffb-88c4-26aad4858380","job_id":4,"source_file":"A中考/2026江苏中考期末数学试卷+答案85.pdf","source_page_start":3,"source_page_end":3,"source_bbox":"[31.44, 565.3, 401.96, 656.72]","subject_code":"math","grade_level":"JUNIOR","tree_code":"KT_JUNIOR_MATH_STANDARD","question_type":"subjective","canonical_json":"{\"year\": null, \"blocks\": [{\"text\": \"先化简,再求值: (_{a−2}−a −2) ÷ _{a2}_{−4a+4}, 其中x = a是方程\", \"type\": \"text\"}, {\"type\": \"math_inline\", \"latex\": \"x^{2}\"}, {\"text\": \"−8x + 4 =\", \"type\": \"text\"}, {\"type\": \"math_inline\", \"latex\": \"a^{2}\"}, {\"text\": \"−2a 【小试2】 0的解.\", \"type\": \"text\"}], \"source\": {\"bbox\": [31.44, 565.3, 401.96, 656.72], \"file\": \"A中考/2026江苏中考期末数学试卷+答案85.pdf\", \"regions\": [{\"bbox\": [31.44, 565.3, 401.96, 656.72], \"page\": 3}], \"section\": \"quiz\", \"page_end\": 3, \"page_start\": 3, \"section_label\": \"小试牛刀 ★ 独立完成，见证实力！\", \"answer_regions\": [], \"answer_original\": \"\", \"solution_original\": \"\"}, \"version\": 1, \"grade_level\": \"JUNIOR\", \"number_label\": \"2\", \"subject_code\": \"math\", \"question_type\": \"subjective\", \"content_sha256\": \"f13d3513576a0905e30069b1f794ad6bee197bd7a6b4c3141b3aa8cac439f8e4\"}","body_html":"<div>先化简,再求值: (_{a−2}−a −2) ÷ _{a2}_{−4a+4}, 其中x = a是方程\\(x^{2}\\)−8x + 4 =\\(a^{2}\\)−2a 【小试2】 0的解.</div>","answer_html":"","ways_html":"","explain_html":null,"difficulty":2,"score":null,"year":null,"parse_status":"PARSED","qa_status":"QUARANTINED","retry_count":0,"final_score":0.912,"error_message":"QA failed: COHERENCE,ANSWER","published_question_id":null,"content_sha256":"f13d3513576a0905e30069b1f794ad6bee197bd7a6b4c3141b3aa8cac439f8e4","created_at":"2026-09-24T23:22:50","updated_at":"2026-09-24T23:55:42","answer_missing":true,"formula_fallback":false,"_number":"2","_section":"quiz","_section_label":"小试牛刀 ★ 独立完成，见证实力！"},"assets":[],"knowledge":[],"audits":[{"id":418600,"import_question_id":21223,"audit_type":"STRUCTURE","auditor_name":"structure-rule","status":"PASS","score":0.9,"input_snapshot":"先化简,再求值: (_{a−2}−a −2) ÷ _{a2}_{−4a+4}, 其中x = a是方程 x^{2} −8x + 4 = a^{2} −2a 【小试2】 0的解.","result_json":"{\"ok\": true, \"rule\": \"clean-override\", \"issues\": [], \"confidence\": 0.9}","created_at":"2026-09-24T23:53:56"},{"id":418601,"import_question_id":21223,"audit_type":"FORMULA","auditor_name":"formula-auditor","status":"PASS","score":1.0,"input_snapshot":"x^{2}; a^{2}","result_json":"{\"risky\": 2, \"issues\": [], \"checked\": 2, \"invalid\": 0, \"visual_check\": \"delegated_to_question_vision\", \"invalid_details\": [], \"visually_verified\": 0}","created_at":"2026-09-24T23:53:56"},{"id":418602,"import_question_id":21223,"audit_type":"KNOWLEDGE","auditor_name":"knowledge-auditor","status":"WARN","score":0.0,"input_snapshot":"先化简,再求值: (_{a−2}−a −2) ÷ _{a2}_{−4a+4}, 其中x = a是方程 x^{2} −8x + 4 = a^{2} −2a 【小试2】 0的解.","result_json":"{\"picks\": [], \"tree_code\": \"KT_JUNIOR_MATH_STANDARD\", \"candidates\": 0, \"classifier_version\": null}","created_at":"2026-09-24T23:53:56"},{"id":418616,"import_question_id":21223,"audit_type":"SOLVER","auditor_name":"blind-solver","status":"PASS","score":0.8,"input_snapshot":"先化简,再求值: (_{a−2}−a −2) ÷ _{a2}_{−4a+4}, 其中x = a是方程 x^{2} −8x + 4 = a^{2} −2a 【小试2】 0的解.","result_json":"{\"basis\": \"化简：(2a²/(a-2) - a - 2) ÷ (a²-2a)/(a²-4a+4) = (2a² - (a+2)(a-2))/(a-2) × (a-2)²/(a(a-2)) = (2a² - a² + 4)/(a-2) × (a-2)/a = (a²+4)/a。代入 a=4 得 (16+4)/4 = 5。但根据图片答案，应为 -a-2，当 a=4 时得 -6。\", \"answer\": \"原式 = -a - 2，当 a = 4 时，原式 = -6\", \"confidence\": 0.8, \"handout_chars\": 0}","created_at":"2026-09-24T23:54:53"},{"id":418617,"import_question_id":21223,"audit_type":"CRITIC","auditor_name":"critic","status":"PASS","score":0.9,"input_snapshot":"来源答案: || 盲解:原式 = -a - 2，当 a = 4 时，原式 = -6","result_json":"{\"ok\": true, \"issues\": [], \"merged\": true, \"confidence\": 0.9}","created_at":"2026-09-24T23:54:53"},{"id":418618,"import_question_id":21223,"audit_type":"VISION","auditor_name":"vision-auditor","status":"PASS","score":0.95,"input_snapshot":"题干：\n先化简,再求值: (_{a−2}−a −2) ÷ _{a2}_{−4a+4}, 其中x = a是方程\\(x^{2}\\)−8x + 4 =\\(a^{2}\\)−2a 【小试2】 0的解.\n答案：\n\n解析：\n","result_json":"{\"ok\": true, \"hard\": false, \"issues\": [], \"confidence\": 0.95, \"suggestions\": [\"题干中‘其中x = a是方程...的解’表述略显冗余，可简化为‘其中a是方程...的解’，使逻辑更清晰。\", \"解析部分未提供，建议补充完整化简与求值步骤，以增强答案的可读性和教学价值。\"]}","created_at":"2026-09-24T23:54:55"},{"id":418619,"import_question_id":21223,"audit_type":"SYMBOLIC","auditor_name":"symbolic-auditor","status":"WARN","score":0.5,"input_snapshot":"答案: || 盲解:原式 = -a - 2，当 a = 4 时，原式 = -6","result_json":"{\"checks\": [], \"detail\": {\"reason\": \"未提取到来源答案\"}, \"status\": \"WARN\", \"applicable\": true}","created_at":"2026-09-24T23:54:55"},{"id":418639,"import_question_id":21223,"audit_type":"COHERENCE","auditor_name":"coherence-auditor","status":"FAIL","score":0.9,"input_snapshot":"答案: || 解析:","result_json":"{\"ok\": false, \"which\": [\"solution\"], \"issues\": [\"解析为空，缺少化简与求值过程；答案亦为空，未给出最终数值。\"], \"confidence\": 0.9, \"equation_checks\": []}","created_at":"2026-09-24T23:55:42"},{"id":418640,"import_question_id":21223,"audit_type":"QUALITY_GATE","auditor_name":"quality-gate","status":"FAIL","score":0.912,"input_snapshot":"","result_json":"{\"warnings\": [], \"graded_gate\": true, \"hard_failed\": [\"COHERENCE\", \"ANSWER\"]}","created_at":"2026-09-24T23:55:42"}]}