һ - רҵ·ĵϷƽ̨

2016-2017学年广东省广州市白云区八年级(?期末数学试卷 - 百度文库

Դû ʱ䣺2025/7/4 0:41:58 loading ƪĵֻ
˵ݽԤݿܲȫҪĵҪݣwordʹáword΢ź:xxxxxxxQQxxxxxx ܸṩĵл֧½⡣

𡿽⣺1ݰС˳Ϊ6788910 ԸݵλΪ8Ϊ8 2ݵƽ=

=8

Ըݵķ=[682+782+882+882+982+1082]= ʴΪ88

⿼˷һиǵƽIJƽƽݵķ㹫ʽǣs2=x1x2+x2x2++xnx2]

198֣ͼEFǾABCDBCϵ㣬AF=DE 1DAFFAB=57AFB= 37.5 㣻 2֤BE=CF

1DAFƽߵAFBɣ 2ֻҪ֤ABFաDCEɽ⣻ 𡿽⣺1ıABCDǾΣ BAD=90㣬ADBC ߡDAFFAB=57 DAF=

90=37.5㣬

AFB=DAF=37.5㣬 ʴΪ37.5

2ıABCDǾΣ B=C=90㣬AB=CD

13ҳ19ҳ

AF=DE

RtABFRtDCE BF=EC BE=CF

⿼εʡȫεжʵ֪ʶĹؼѧ֪ʶ⣬пͣ

209֣֪y+4xx=6ʱy=8 1yx֮ĺϵʽ

2ֱϵͼлͼ 3ֱд4y0ʱԱxȡֵΧ

1Ķy+4=kxk0Ȼ֪ݴмkֵɵý⣻

2Ľ㣬Ȼ㷨ͼ󼴿ɣ 3ͼɵýۣ

𡿽⣺1y+4x y+4=kxk0 ߵx=6ʱy=8

14ҳ19ҳ

8+4=6k k=2 y+4=2x

ϵʽΪy=2x4

2x=0ʱy=4 y=0ʱ2x4=0x=2

ԣͼ󾭹㣨0420 ͼͼ

3ͼã4y0ʱԱxȡֵΧǣ0x2

⿼˴ϵһκʽһκͼĶʽǽĹؼ

219֣֪ͼڡABCУB=45㣬C=60㣬AB=31A= 75 㣻 2ABCľ룻

3BCijøűʾ

1ڽǺͶ㼴ɣ

15ҳ19ҳ

2ҵĶAD

3еĶCD㼴ɣ 𡿽⣺1A=180㩁B+C=75㣬 ʴΪ75 2ADBCD

RtABDУAD=ABsinB=3 ABCľΪ3

3RtABDУBD=ABcosB=3 RtACDУCD=BC=BD+CD=3+

=

⿼ǽֱΣǺĸǽĹؼ

2210֣ͼƽֱϵУֱl1y=x+6ֱxᡢyύڵBCֱl2y=xڵA 1A꣮

2D߶OAϵĵ㣬ҡCODΪ12ֱCDĺʽ 3ڣ2£PCDϵĵ㣬ƽǷڵQʹOCPQΪıΣڣֱдPꣻڣ˵ɣ

1ֱ߽ʽA꼴ɣ

16ҳ19ҳ

2016-2017学年广东省广州市白云区八年级(?期末数学试卷 - 百度文库.doc ĵWordĵصԣ㸴ơ༭ղغʹӡ
Ƽ
Copyright © 2012-2023 һ Ȩ | ϵ
:վز֪ʶȨݡϢ紫ȨתصƷַȨ,һ֪ͨǣǻἰʱɾ
ͷQQxxxxxx 䣺xxxxxx@qq.com
ICP2023013149
Top