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第197期【试题研修】2026年河北中考数学第9题

第197期【试题研修】2026年河北中考数学第9题

中考高频考点

①基础考查:翻折、平行四边形判定与相似证明

②母题再现角分线+平行线得等腰三角形。

③灵活运用:相似三角形面积比与对应边比关系。

原题呈现

解析:

1.基础:平行四边形判定

∵AD∥BC,AE∥DC

∴四边形AECD是平行四边形

∴AD=EC

已知BC = 3AD,设AD = x,则BC = 3x,EC = x,

∴ BE = BC - EC = 3x - x = 2x。 

△ABE沿AE翻折得到△ AB'E,

∴ B'E = BE = 2x,∠B' = ∠B,

S△AB'E = S△ ABE,

∠AEB =∠ AEB'

2. 母题:角分线+平行线得等腰三角形

∵AE∥DC

∴∠AEB=∠C,

  ∠ AEB'=∠EHC

∴∠EHC =∠C

∴EN=EC

∴EN=EC=x

∴B'N=B'E-EN=2x-x=x

3. 基础:证明相似

∵ AE ∥ DC,

∴∠B'NM=∠B'EA

又∠ B' =∠B' ,

∴△ B'NM ∽△ B'EA。

4. 基础:求相似比

∴ B'N:B'E = x:2x = 1:2。

5. 应用:求面积比。相似三角形面积比等于相似比的平方:

S△B'NMS△B'EA=(B'N:B'E)²=(1:2)²=1:4

又∵S△ AB'E = S△ABE,

∴S△MB'N:S△ABE= 1:4。

最终答案:选C

复盘教材,回归课堂

01

平行四边形判定与相似证明

教材来源:人教版八年级下册 《平行四边形》最经典的例题集中在课本之中,它完美展示了判定定理的应用:

典型题目:如图,在▱ABCD中,E、F分别是AB、CD的中点。求证:四边形EBFD是平行四边形。

解题思路:利用“一组对边平行且相等”的判定定理。因为ABCD是平行四边形,所以AB∥CD且AB=CD。又因E、F是中点,可得EB=FD,加上EB∥FD,即可得证。

更多练习:在课后习题及配套的《平行四边形的判定》专题课件中,还有很多关于“两组对边分别平行”“一组对边平行且相等”、“对角线互相平分”等判定方法的变式题。

总结归纳教材中,相似的判定方法:

两角分别相等;两边成比例且夹角相等(注意夹角是前提);三边成比例:需分别计算三边比值是否相等。常出现在网格图中,如判断格点三角形是否与△ABC相似,需通过勾股定理算边长比。

拓展经典模型练习:

平行线法:“A”“X”型:公共角+已知角相等

母子直角三角形:利用同角的余角相等

折叠问题:折叠后,对应角相等来证相似。

02

角平分线+平行线得等腰三角形

教材来源:人教版八年级上册(角平分线与等腰三角形)、八年级下册(平行四边形)这个模型的核心是“知二推一”:角平分线、平行线、等腰三角形这三个条件,只要知道其中任意两个,就能推出第三个。

课本母题:该模型的原型出现在八年级上册练习题。已知AD∥BC,BD平分∠ABC,求证AB=AD。这其实就是利用平行线得到内错角相等,再结合角平分线推出等角,从而得到等腰三角形。

典型应用:上述课本母题中,如果延长DE和CB交于一点,就可能需要用到这个模型来证明新的等腰三角形,帮助解题。

03

相似三角形面积比与对应边比关系

教材来源:人教版九年级下册《相似》

这个知识点是相似三角形性质的核心,定理直接来自课本。

核心定理:相似三角形面积的比等于相似比的平方。

典型例题:课本例题是经典应用。在△ABC和△DEF中,已知AB=2DE,AC=2DF,∠A=∠D,且△ABC的周长是24,面积是48,求△DEF的周长和面积。

解题思路:通过两边对应成比例且夹角相等,先证明两三角形相似且相似比为2:1。然后根据“周长比等于相似比,面积比等于相似比的平方”即可算出答案。

中考源于课堂教学

试题分析:四边形翻折与相似三角形综合题

一、题目考点

这道题综合考查了:

1. 平行四边形的判定与性质(AD∥ BC、AE∥ DC 推出 AECD 是平行四边形)

2. 翻折(轴对称)的性质(翻折前后对应边相等、对应角相等,面积相等)

3. 相似三角形的判定与性质(AA判定相似,面积比等于相似比的平方)

4. 线段比例分析(利用 BC=3AD 推导线段长度关系)

二、解题关键步骤

1. 构造平行四边形:由 AD∥ BC、AE∥ DC,得 AECD 是平行四边形,因此 AD=EC。

2. 线段比例推导:设 AD=x,则 BC=3x,EC=x,故 BE=2x,翻折后 B'E=2x。

3. 相似三角形判定:由 AE∥ DC,得 ∠AEB=∠ MNE,结合∠ B'=∠ B,可证△MB'N∽△ AB'E。

4. 相似比与面积比:推得 B'N:B'E=1:2,因此面积比为(1∶2)²=1∶4。

三、常见错误分析

1. 平行四边形性质应用失误:误判 EC 与 AD 的等量关系,导致线段比例计算错误。

2. 翻折性质理解不透彻:忽略翻折前后对应边、对应角相等,无法建立 △ AB'E 与△ ABE 的面积关系。

3. 相似三角形判定错误:无法找到两组对应角相等,无法证明△ MB'N 与 △ AB'E 相似。

4. 面积比公式混淆:误将相似比直接作为面积比,忘记面积比是相似比的平方。

四、教学/学习建议

1. 强化平行四边形+翻折组合图形的性质梳理,明确翻折前后的等量关系。

2. 专项训练相似三角形的判定方法,尤其是平行线带来的同位角、内错角相等。

3. 牢记相似三角形面积比等于相似比的平方这一核心结论,避免概念混淆。

4. 多做此类“比例推导+相似”的综合题,提升线段分析和图形转化能力。

2026中考结束更是新的开始

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  1. CONNECT:[ UseTime:0.000631s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000803s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000370s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000288s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000483s ]
  6. SELECT * FROM `set` [ RunTime:0.000217s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000539s ]
  8. SELECT * FROM `article` WHERE `id` = 815857 LIMIT 1 [ RunTime:0.000467s ]
  9. UPDATE `article` SET `lasttime` = 1782722071 WHERE `id` = 815857 [ RunTime:0.005179s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000298s ]
  11. SELECT * FROM `article` WHERE `id` < 815857 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002783s ]
  12. SELECT * FROM `article` WHERE `id` > 815857 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000471s ]
  13. SELECT * FROM `article` WHERE `id` < 815857 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004262s ]
  14. SELECT * FROM `article` WHERE `id` < 815857 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000833s ]
  15. SELECT * FROM `article` WHERE `id` < 815857 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006990s ]
0.108710s