安徽寿县第一中学2020中考提前自主招生数学模拟试?9?附解?- 百度文库 ر

22. ͼACΪABCDĶԽߣABAE۵ʹ

BACϵĵMCDCF۵ʹDACϵĵN

1֤ıAECFƽıΣ

2BAEΪٶʱıAECFΣ˵ɣ

23. ij˾֯ԱľΣṩ

ѷͼʾͼͼABCDʾ˾շyԪμεxˣ֮ĺϵ

1με10ʱ˾շΪ______Ԫ

2ù˾֧3600ԪôμεǶ٣

24. ͼһֲ״Ϊε䣬Ǵ򿪺󣬸ӵһ˿ǽϣʱBC=10cm

׶˵EǽGľΪ65cmDCG=60㣮

1ƵAתĽǶΪ______BǽľΪ______cm

2ӵĿEFÿѧοݣ =1.41 =1.73

25. ͼֱϵУMԭO00A ϣӣ 0B0- Dӻ

BDxڵCҡCOD=CBO

1Mİ뾶 2֤BDƽ֡ABO

3߶BDӳһEʹֱAEǡ

ΪMߣʱE꣮

2

26. ͼƽֱϵУκy=ax+bx- ͼ󾭹A-10C20yύڵBԳ

xύڵD 1κıʽ䶥ꣻ 2MstΪ߶Գϵһ㣬

ƽڴڵNʹABMNΪıΪΣֱдMꣻ

MAMBAMBС60㣬tȡֵΧ

27. ABCDı߳Ϊ1OBCϵһ㣨BCغϣOΪ

BCֱߵϷMON=90 1OMAʱ

ֱգON______ܣܣD㣺ͼ1

ͼ2ONϽȡOE=OAEEFֱֱBCΪFEHCDH֤ıEFCHΪΣ

ͼ2е֪ۻONȡEEABCDⲿEEFֱֱBCΪFEHCDHıEFCHΪΣôOEOAǷȣ˵ɣ

2OBCOMAʱOMABGOG=2ONϴڵPPPKֱֱBCΪKʹSPKO= SOBGGPBOΪֵʱıPKBGΪ٣

𰸺ͽ

1.𰸡B

⣺2ƽǣ ѡB

ƽĶֱӽ𼴿ɣ

⿼ƽĶ壬һƽƽ 2.𰸡C

336

⣺Aa?a=aʴѡ Ba3+a3=2a3ʴѡ Ca32=a6ȷ

628

Da?a=aʴѡ ѡC

ֱͬݵij˳㷨Լݵij˷㡢ϲͬжϵó𰸣 Ҫͬݵij˳Լݵij˷㡢ϲ֪ͬʶȷ㷨ǽؼ 3.𰸡D

⣺180000ÿѧʾΪ1.8105 ѡD

n

ѧıʾʽΪa10ʽ1|a|10nΪȷnֵʱҪԭaʱСƶ˶λnľֵСƶλͬԭֵ1ʱnԭľֵ1ʱnǸ

⿼ѧıʾѧıʾʽΪa10nʽ1|a|10nΪʾʱؼҪȷȷaֵԼnֵ 4.𰸡A

⣺߿õһΣ ѡA

ͼǴ߿óͼΣͼμѡɵó𰸣

⿼˼򵥼ͼڻ⣬ĹؼͼĹ۲λã 5.𰸡A

⣺۲񣬿֪ݵƽΪ 04+112+216+317+4150=

У317ΣֵĴ࣬ ݵ3

߽ݰС˳Удм2 ݵλΪ2 ѡA

ȸݱʾݵó50ѧIJȻ50ƽУ3ֵĴ࣬ݰС˳У