ʱ : 内蒙古呼和浩特市2018-2019学年八年级下期末考试数学试题(无答? - 百度文库ϿʼĶ
18.(6)ͼƽıABCDУӳABEӳCDFʹBE=DFEFԽACڵO.֤:OE=OF
19.(5)ijסԱ400ˣΪ˽Ա˳飬£벹 ռݣ
ӼסŸȡ20ԱܲԣԳɼ(ٷ)£ ף78,86,74,81,75,76,87,70,75,90,75,79,81,70,74,80,86,69,83,77
ң83,73,88,81,72,81,94,83,77,83,80,81,70,81,73,88,82,79,70,41 :
·:
(˵:ɼ80ּΪ㣻70-79Ϊã60-69Ϊܺϸ60Ϊܲϸ)
ݵƽλ±ʾ óۣ
(1)ҲԱΪ_____________
(2)ƶϳ______Աˮƽϸ,Ϊ_____________________(ٴͬĽǶ˵ƶϵĺ)
20.(6)һӵļ۸Ϊ5Ԫ/kgAһι2kgϵӣ2kgֵӼ۸ۡ (1)д±: /kg 0.5 1 1.5 2 2.5 3 3.5 4 ƽ 78.3 78 λ 77.5 8.0.5 75 81 /Ԫ (2)дڹĺʽͼ
21.(6)ͼABCDУEBCе㣬FCDһ㣬CF=֤AEF=90
1CD. 4
22.(6)ס̻˾ƳУ̻շѷ
˾:ÿµy(Ԫ)̻x(ƽ)һκϵͼʾ
ҹ˾:̻1000ƽʱ,ÿȡ5500Ԫ̻1000ƽʱ,ÿȡ5500ԪĻ,ÿƽȡ4Ԫ (1)ͼʾyxĺʽ(ҪдԱȡֵΧ)
(2)ijѧУĿǰ̻1200ƽ,ͨ˵:ѡļҹ˾ķ,ÿµ̻ý٣
23.(6)ͼABCDضԽACۣBڵFFCADڵE. (1) ֤AE=CE
(2)AB=4BC=8ͼӰֵ
24.(7)AB60kmס˴سУȳͼl1l2ʾAصľs(m)ʱt(h)Ĺϵ,ͼͬ⣺
(1)ʾAصľʱϵͼ_________(l1l2)ٶ_____km/hҵٶ_______km/h.