2022-2023學(xué)年度第一學(xué)期八年級(jí)數(shù)學(xué)學(xué)科期中抽測(cè) 評(píng)分標(biāo)準(zhǔn)一、選擇題（本大題有8小題，每小題3分，共24分）題號(hào)12345678選項(xiàng)BABCCDAD二、填空題（每題共8小題，每題4分，共32分．說(shuō)明：第16題只看對(duì)1個(gè)2分，對(duì)2個(gè)3分，對(duì)3個(gè)4分） 9．   30        10．     100         11．   10        12．∠B=∠C（答案不唯一）          13．  15        14．     20        15．   90      16．  70°或40°或55°    三、解答題（本大題有9小題，共84分）
17．（每空1分，共8分）已知，∠ABO=∠CDO，∠ABO=∠CDO，∠AOB=∠COD，對(duì)頂角相等，AAS，全等三角形的對(duì)應(yīng)邊相等?????????????  18．∵AD平分∠BAC，·····························1分DE⊥AB，DF⊥AC，垂足為E，F·····························2分∴DE=DF，······················3分∠BED=∠CFD=90°，·············4分在Rt△BED和Rt△CFD中，∠BED=∠CFD=90°，·····························6分∴Rt△BED≌Rt△CFD，············7分∴BE=CF，··················8分19．（1）如圖所示··············4分（每個(gè)點(diǎn)1分）    （2）如圖所示················7分（3）16···················10分          20． （1）證明：∵AE∥CF，∴∠AEF=∠CFE，················1分∴∠AEB=∠CFD，················2分∵DE=BF，∵DF=BE，······················4分在△ABE和△CFD中，·····························7分∴△ABE≌△CFD，···············8分（2）AB=CD，AB∥CD·············10分21．證明：在等邊△ABC中，AB=BC，∠ABC=∠ACB=60°， 2分∵BD是邊AC上的高，∴∠ABD=∠CBD=30°,···············4分∵CE=CD，∴∠CDE=∠CED，··················6分∵∠ACB是△CDE的外角，∴∠CED=30°，··················8分∴∠DBC=∠CED，··················9分∴BD＝DE． 10分22．（1）在△ABC中，∵，，······························································3分∴，································································4分故△ABC是直角三角形，且∠ACB=90°，····································5分∵點(diǎn)D是AB的中點(diǎn)，∴CD=BD=,···························································7分∴∠B=∠BCD=50°，···················································8分∴∠DCA=∠ACB－∠BCD=90°－50°=40°．·································9分（2）······························································12分
23．（1）如圖·································6分（2）解：∵                                ······································8分           又∵·····································10分             ∴······································12分   24．在△ABC中，∵AB=AC，∠BAC=90°，∴∠B=∠C=45°，  1分又∵點(diǎn)D是BC的中點(diǎn)，∴AD=BD=，且AD⊥BC，∠BAD=∠CAD= 2分∴∠ADN+∠BDN=90°，又∵△DEF是直角三角尺，∴∠EDF =90°，即∠ADN+∠ADM=90°,∴∠BDN=∠ADM  3分在△BDN和△ADM中∴△BDN≌△ADM， ···············5分∴DN=DM；··························································6分
（2）∵△BDN≌△ADM∴BN= AM，∠BND=∠AMD，DN=DM········································7分∴∠BNF=∠AME，且由于△DEF是含45°直角三角尺，∴DF=DE，∴DF－DN=DE－DM即FN=EM····························································8分在△BNF和△AME中∴△BNF≌△AME，∴AE=BF；···························································9分
（3）作圖正確（如圖所示）·············································10分猜想：AE⊥BF，理由如下：··············································11分∵△BNF≌△AME，∴∠BFN=∠AEM， ∵∠FDE=90°，∴∠AEM+∠APD=90°又∵∠APD=∠FPQ，···················································12分∴∠FPQ+∠BFN=90°，∴∠FQP =90°，······················································13分∴AE⊥BF．··························································14分 

相關(guān)試卷

江蘇省徐州市2022-2023學(xué)年八年級(jí)下學(xué)期期中檢測(cè)+數(shù)學(xué)試卷：

這是一份江蘇省徐州市2022-2023學(xué)年八年級(jí)下學(xué)期期中檢測(cè)+數(shù)學(xué)試卷，共4頁(yè)。

江蘇省徐州市睢寧縣2022-2023學(xué)年七年級(jí)上學(xué)期期中數(shù)學(xué)試卷（含答案）：

這是一份江蘇省徐州市睢寧縣2022-2023學(xué)年七年級(jí)上學(xué)期期中數(shù)學(xué)試卷（含答案），共8頁(yè)。試卷主要包含了選擇題，填空題，解答題等內(nèi)容，歡迎下載使用。

江蘇省徐州市睢寧縣2022-2023學(xué)年七年級(jí)上學(xué)期期中數(shù)學(xué)試卷(含答案)：

這是一份江蘇省徐州市睢寧縣2022-2023學(xué)年七年級(jí)上學(xué)期期中數(shù)學(xué)試卷(含答案)，共17頁(yè)。試卷主要包含了選擇題，填空題，解答題等內(nèi)容，歡迎下載使用。

英語(yǔ)朗讀寶

相關(guān)試卷 更多

江蘇省徐州市2022-2023學(xué)年七年級(jí)上學(xué)期期中數(shù)學(xué)試卷

江蘇省徐州市2022-2023學(xué)年七年級(jí)上學(xué)期期中數(shù)學(xué)試卷
江蘇省徐州市2022-2023學(xué)年八年級(jí)上學(xué)期期中檢測(cè)數(shù)學(xué)試卷（含答案）

江蘇省徐州市2022-2023學(xué)年八年級(jí)上學(xué)期期中檢測(cè)數(shù)學(xué)試卷（含答案）
江蘇省徐州市鼓樓區(qū)2022-2023學(xué)年八年級(jí)上學(xué)期期中考試數(shù)學(xué)試卷(含答案)

江蘇省徐州市鼓樓區(qū)2022-2023學(xué)年八年級(jí)上學(xué)期期中考試數(shù)學(xué)試卷(含答案)
2022-2023學(xué)年江蘇省徐州市鼓樓區(qū)八年級(jí)（上）期中數(shù)學(xué)試卷（含答案解析）

2022-2023學(xué)年江蘇省徐州市鼓樓區(qū)八年級(jí)（上）期中數(shù)學(xué)試卷（含答案解析）
資料下載及使用幫助
版權(quán)申訴
版權(quán)申訴
若您為此資料的原創(chuàng)作者，認(rèn)為該資料內(nèi)容侵犯了您的知識(shí)產(chǎn)權(quán)，請(qǐng)掃碼添加我們的相關(guān)工作人員，我們盡可能的保護(hù)您的合法權(quán)益。
入駐教習(xí)網(wǎng)，可獲得資源免費(fèi)推廣曝光，還可獲得多重現(xiàn)金獎(jiǎng)勵(lì)，申請(qǐng) 精品資源制作， 工作室入駐。
版權(quán)申訴二維碼
期中專區(qū)
歡迎來(lái)到教習(xí)網(wǎng)
  • 900萬(wàn)優(yōu)選資源，讓備課更輕松
  • 600萬(wàn)優(yōu)選試題，支持自由組卷
  • 高質(zhì)量可編輯，日均更新2000+
  • 百萬(wàn)教師選擇，專業(yè)更值得信賴
微信掃碼注冊(cè)
qrcode
二維碼已過(guò)期
刷新

微信掃碼，快速注冊(cè)

手機(jī)號(hào)注冊(cè)
手機(jī)號(hào)碼

手機(jī)號(hào)格式錯(cuò)誤

手機(jī)驗(yàn)證碼 獲取驗(yàn)證碼

手機(jī)驗(yàn)證碼已經(jīng)成功發(fā)送，5分鐘內(nèi)有效

設(shè)置密碼

6-20個(gè)字符，數(shù)字、字母或符號(hào)

注冊(cè)即視為同意教習(xí)網(wǎng)「注冊(cè)協(xié)議」及「隱私條款」
QQ注冊(cè)
手機(jī)號(hào)注冊(cè)
微信注冊(cè)

注冊(cè)成功

返回
頂部