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试题赏析 | 根植本土应用情境 聚焦方程建模素养——2026重庆中考数学第21题赏析

试题赏析 | 根植本土应用情境 聚焦方程建模素养——2026重庆中考数学第21题赏析

1 原题呈现

2 试题赏析

2.1 考查内容

      本题属于数与代数领域中方程模块核心考点,分层覆盖一元一次方程、分式方程两大中考必考方程模型。第(1)小问依托数量差、总量等量两组文字等量关系,考查一元一次方程建模、求解与实际问题验根;第(2)小问以产能下调为新情境,围绕“工作总量÷日产量=生产天数”这一工程问题底层逻辑,构建分式方程,考查分式方程列写、求解、增根判别、实际意义取舍等完整知识链条。同时渗透文字信息提取、变量设定、数学语言转译、结果检验等数学阅读核心能力,兼顾基础运算与应用建模双重知识维度,贴合重庆中考方程应用题固定考查范围。

2.2 命题意图

       命题取材锚定重庆本土智能制造企业生产实景,跳出传统工程修路、行程赶路、商品销售等老旧命题素材,让试题具备地域辨识度。命题采用“两小问梯度递进”的经典布局:第一问低门槛入题,面向全体考生,落实方程基础应用的学业合格考查目标;第二问适度抬升思维层级,聚焦分式方程中考高频易错点(增根、实际取值检验),实现对优等生思维区分。真正理解方程是刻画现实等量关系的数学工具这一核心本质,完成从“会解方程”到“会用方程建模”的能力跃迁。

2.3 命题导向

(1)坚持重庆中考一贯的本土情境命题特色,立足重庆智能制造产业背景创设应用题,打通数学知识与地方产业生活的壁垒,引导师生意识到数学源于本土生产生活,破除数学“纸上谈兵”的刻板印象;

(2)紧扣新课标数学建模核心素养考查方向,全程引导学生完成“现实情境→提取等量关系→设定变量→构建方程→求解检验→回归现实解释”的完整建模闭环,践行素养立意的中考改革导向;

(3)小问由浅入深、层层铺垫,第(1)问的求解结果直接作为第(2)问的已知条件,既降低试题整体难度、保证试卷均分稳定,又能精准区分不同层级学生的应用能力,适配中考选拔功能。

2.4 试题特点

(1)素材鲜活,地域印记鲜明。摒弃老旧陈旧的应用题背景,选用重庆优势产业智能机器人配件生产为载体,贴合当下工业发展现状,兼具时代感与重庆本土特色,让本地考生具备情境代入感,降低陌生情境带来的读题障碍;

(2)结构递进,逻辑衔接紧密。两小问一脉相承,前一问的结论为后一问提供数据支撑,试题整体浑然一体,并非两道孤立小题拼接,契合重庆中考解答题“递进式设问”的典型命题范式;

(3)考点聚焦,易错点精准布设。一元一次方程、分式方程两大核心考点全覆盖,精准命中重庆中考方程应用题两大必考题型,同时把分式方程增根、实际问题验根等高频失分点融入设问,区分功能突出。

2.5 解法分析

第(1)问解法路径

       思路1(一元一次方程,最优解法):抓住“A日产量比B少30个”设元,设日均生产A型配件x个,则B型为(x+30)个,再依托“3天A总量=1天B总量”列等式3x=x+30,方程简洁、计算量极小,是考场最优解法;

       思路2(二元一次方程组):分别设A、B日产量为x、y,联立方程组求解,适合方程组掌握扎实的学生,但列式步骤更多,耗时更长;

       思路3(分式方程):反向设元会构建分式方程,舍近求远,不推荐。

第(2)问解法路径

      抓住两种配件生产天数相等构建等量式。先用(1)的结果得到原日产量,下调后A日产量为(45-a)个、B为(75-2a)个,根据天数相等列分式方程;求解后必须完成两步检验:一是检验所得根是否为分式方程的增根,二是检验日产量(45-a)、(75-2a)必须为正数,符合生产实际意义。

2.6 规范解答

3 教学启示

3.1情境教学要扎根本土,跳出题海桎梏。方程教学不能只刷题海中抽象文字题,多挖掘重庆本地工业、商贸、基建、民生类真实素材改编应用题,让学生熟悉本土情境的语言表达逻辑,消解中考应用题的读题畏难情绪,培育数学阅读能力;

3.2建模教学重流程,固化完整建模步骤。课堂上要强制固化“读题圈画等量关系→合理设元→列写方程→规范求解→双重检验(方程验根+实际意义检验)”的五步建模流程,尤其强化分式方程解后检验的习惯养成,杜绝只解方程不检验的通病;

3.3 梯度设问常态化,贴合中考命题逻辑。新授课、习题课设计应用题时,多采用“前问铺垫、后问延伸”的递进式两小问结构,贴合重庆中考解答题的设问规律,训练学生利用前序结论解决后续问题的思维意识.

复习建议

4.1专题整合归类,构建方程题型体系。初三一轮复习拆分“一元一次方程应用、分式方程应用”两大专题,按工程问题、产量问题、销售问题、行程问题细分题型,梳理每类题型固定的核心等量关系式,形成题型知识库;

4.2 聚焦重庆真题溯源,把握命题规律。整理近十年重庆中考方程应用题真题,总结本土情境选材规律、两小问递进设问模式、分式方程必考检验的命题特点,让复习精准对标本地中考考情,摒弃全国泛题训练;

4.3限时模拟训练,适配中考答题节奏。将此类两小问方程题作为中考解答题第21题固定题型限时训练,把控答题时长,规范书写步骤,适配重庆中考答题格式评分标准,避免步骤失分。

5 结语

本题作为重庆中考典型的方程应用解答题范本,以重庆智能制造产业为底色,以梯度化设问为骨架,以数学建模素养为内核,既守住了方程知识考查的根基,又贴合新课标素养立意的中考改革方向,更是重庆本土中考命题特色的集中体现。在后续初中数学教学与中考备考中,唯有深耕情境建模教学、贴合本地中考命题逻辑、强化答题规范训练,才能真正让学生掌握方程应用的核心要义,从容应对中考同类试题考查。这类根植本土、梯度清晰、素养导向的应用题,也将持续成为重庆中考数式应用板块的主流命题方向,值得一线教师持续研究与借鉴。

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  1. CONNECT:[ UseTime:0.000448s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000660s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000256s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000279s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000479s ]
  6. SELECT * FROM `set` [ RunTime:0.000201s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000561s ]
  8. SELECT * FROM `article` WHERE `id` = 782599 LIMIT 1 [ RunTime:0.000392s ]
  9. UPDATE `article` SET `lasttime` = 1782317077 WHERE `id` = 782599 [ RunTime:0.000673s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000340s ]
  11. SELECT * FROM `article` WHERE `id` < 782599 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000563s ]
  12. SELECT * FROM `article` WHERE `id` > 782599 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000443s ]
  13. SELECT * FROM `article` WHERE `id` < 782599 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000712s ]
  14. SELECT * FROM `article` WHERE `id` < 782599 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000771s ]
  15. SELECT * FROM `article` WHERE `id` < 782599 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000974s ]
0.098887s