{"ok":true,"question":{"id":21340,"question_uuid":"db134dc8-5dfe-4bcb-ac3f-5e014d032f5f","job_id":4,"source_file":"A中考/2026江苏中考期末数学试卷+答案90.pdf","source_page_start":4,"source_page_end":4,"source_bbox":"[30.0, 149.62, 447.06, 227.01]","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: (_{a2}_{−b2} − _{a+b}) ÷ _{a2}_{−ab}, 其中a, b是方程\", \"type\": \"text\"}, {\"type\": \"math_inline\", \"latex\": \"x^{2}\"}, {\"text\": \"+ x −6 = 0的两个根. a 1 1\", \"type\": \"text\"}], \"source\": {\"bbox\": [30.0, 149.62, 447.06, 227.01], \"file\": \"A中考/2026江苏中考期末数学试卷+答案90.pdf\", \"regions\": [{\"bbox\": [30.0, 149.62, 447.06, 227.01], \"page\": 4}], \"section\": \"match\", \"page_end\": 4, \"page_start\": 4, \"section_label\": \"智适化匹配练习 ★\", \"answer_regions\": [], \"answer_original\": \"\", \"solution_original\": \"\"}, \"version\": 1, \"grade_level\": \"JUNIOR\", 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