山東省濟(jì)南市高新區(qū)2024-2025學(xué)年七年級(jí)上學(xué)期期末考試數(shù)學(xué)試題答案

2024至2025學(xué)年第一學(xué)期期末學(xué)業(yè)水平測(cè)試高新初中數(shù)學(xué)七年級(jí)參考答案及評(píng)分標(biāo)準(zhǔn)一、選擇題：（本大題共12個(gè)小題，每小題4分，共48分．）題號(hào)123456789101112答案ADBCACDCABBA二、填空題:（本大題共6個(gè)小題，每小題4分，共24分．）13．1000．14．＞．15．37．16．﹣3．17．二．18．（20n﹣13）．Oxy三、解答題:（本大題共12個(gè)小題，共Oxy19．（本題4分）解：原式＝8+3﹣2﹣15＝11﹣17································································································2分＝﹣6····································································································4分20．（本題4分）解：原式=25×85＝10·····································································································4分21．（本題4分）解：x+（5x﹣3y）﹣（x﹣2y）＝x+5x﹣3y﹣x+2y·····························································································2分＝5x﹣y··········································································································4分22．（本題5分）解：原式=?9?＝﹣9+12﹣8﹣20·····················································································4分＝﹣25··································································································5分23．（本題5分）解：2x+132（2x+1）﹣（5x﹣1）＝6······················································································2分4x+2﹣5x+1＝6····································································································3分﹣x＝3···············································································································4分x＝﹣3···············································································································5分24．（本題6分）解：如圖，每小題2分25．（本題6分）解：80，AOC，BOC，AOB，AOC，20．每空1分26．（本題6分）解：原式＝2y2+2x2﹣2y﹣2y2+y＝2y2﹣2y2+2x2﹣2y+y＝2x2﹣y········································································································4分當(dāng)x＝﹣2，y＝3時(shí)，原式＝2×（﹣2）2﹣3＝2×4﹣3＝8﹣3＝5···············································································································6分27．（本題8分）解：任務(wù)1：由題意得100×200+（200﹣100）×80＝28000（元）····································2分100×200×80%+200×80×80%＝28800（元）····························································4分即方案一的費(fèi)用是28000元，方案二的費(fèi)用是28800元；任務(wù)2：方案一：100×200+（x﹣100）×80＝（80x+12000）（元）·······························6分方案二：100×200×80%+80×80%x＝（64x+16000）（元）···········································8分28．（本題8分）解：（1）70﹣x；100﹣x·························································································2分（2）（﹣10x+15000）························································································4分（3）140x+150（100﹣x）+200（70﹣x）+80（x+10）＝25900···································6分x＝30···································································································7分答：甲倉(cāng)庫(kù)運(yùn)到A工地的是30噸········································································8分29．（本題10分）解：（1）12；4：3··································································································3（2）如圖，當(dāng)點(diǎn)D在射線AB上時(shí)，·························································································5分∵線段AB＝8cm，點(diǎn)C為線段AB的中點(diǎn)，∴BC=1∵BD＝lcm·····································································································7分∴CD＝BC+BD＝5cm························································································9分（3）分類討論···································································································10分30．（本題12分）解：（1）2；0；10；﹣8·····················································································4分（2）①設(shè)運(yùn)動(dòng)時(shí)間為t秒，則PB＝2t···································································5分易得方程2t＝2（2t﹣60）··················································································7分所以t＝60······························