2017中考数学一轮复习教案完整版 - 百度文库 ر

ڶ ʵ ֪ʶ㣺ࡢ㷨ɡ˳򡢿ѧЧ֡IӦá Ҫ 1˽ļӡˡ壬˷ݵйظ㷨ί˳ؽӡˡ˷ͼ򵥵Ļ㡣 2˽ʺ㷨ʵͬãϰ㷨ɼȷʵļӡˡ˷㡣 3˽׼ȷĸָȷȻЧֵĸ뷨ĽֵڽijЩʵʱҲýһȥβȡֵᰴҪľȷýƵСʵĽ㡣 4 ˽Ӽʹû̡õӼ㡣 ص㣺 1Ч֡ѧ㷨 2ʵ㣻 3ʹá ʵ (1)ӷ ͬӣȡԭķţѾֵӣ ӡȡֵϴķţýϴľֵȥСľֵ κӵԭ (2) a-b=a+(-b) (3)˷ ˣͬŵŵøѾֵˣκ㣮 ?|a|?|b|(a,bͬ)? ab???|a|?|b|(a,b) ?0(abΪ)?a1?a?(b?0) bbn(5)˷ a?aa?a ???(4) n(6) xax0ôax x=aô3a?x 23ͬһʽȳ˷Ȼˡӡʱ森 3ʵ (1)ӷ a+bb+a (2)ӷ (a+b)+c=a+(b+c) (3)˷ abba (4)˷ (ab)c=a(bc)

5

ڶ ʵ

֪ʶ㣺ࡢ㷨ɡ˳򡢿ѧЧ֡IӦá Ҫ

1˽ļӡˡ壬˷ݵйظ㷨ί˳ؽӡˡ˷ͼ򵥵Ļ㡣

2˽ʺ㷨ʵͬãϰ㷨ɼȷʵļӡˡ˷㡣

3˽׼ȷĸָȷȻЧֵĸ뷨ĽֵڽijЩʵʱҲýһȥβȡֵᰴҪľȷýƵСʵĽ㡣

4 ˽Ӽʹû̡õӼ㡣 ص㣺

1Ч֡ѧ㷨 2ʵ㣻 3ʹá ʵ (1)ӷ

ͬӣȡԭķţѾֵӣ

ӡȡֵϴķţýϴľֵȥСľֵ κӵԭ (2) a-b=a+(-b) (3)˷

ˣͬŵŵøѾֵˣκ㣮

?|a|?|b|(a,bͬ)? ab???|a|?|b|(a,b)

?0(abΪ)?a1(4) ?a?(b?0)

bbn(5)˷ a?aa?a ???n(6) xax0ôax x=aô3a?x

2

3

ͬһʽȳ˷Ȼˡӡʱ森 3ʵ

(1)ӷ a+bb+a

(2)ӷ (a+b)+c=a+(b+c) (3)˷ abba (4)˷ (ab)c=a(bc) (5) a(b+c)=ab+ac

abcʾʵʱʹ㣮 ϰ

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һ⣺

1ҹѧգǵһҵԲʦзˣеĽֵ3.1416ȡ3.142Ǿȷ λ Чֱ֣

1.5972ȷٷλĽ ҹĹԼΪ9600000ƽףÿѧʾΪ ƽס 2I˳124

3ҹ1990˿ڳΪ23784659ˡЧֵĽֵ ˡ

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4뷨õĽ3.1010ȷ λֵЧ

52෴뵹ĺ͵ľֵ

2n+12n

6nΪȻʱ(1)+(1)= .

23223

72.134.54.10569.1821.3 0.0213 0.4105 410.5 8.32069.32,x6.93210x .4.44 2.107 44.4 6.663 0.00444 .

28.֪2ab4, 2(b2a)3(b2a)1 12

9֪x|4y x>0,y<0xy

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A1.25A1.35 B1.20A1.30 C1.295A1.305 D1.300A1.305 3aΪʵ|a+|a||Ľ A ǸBǸCһǸD 4֪|a|8|b|2|ab|=ba,a+bֵǣ A 10 B6 C610 D10 5ֵС8ĺ( )

(A)0 (B)28 (C)28 (D)϶ 6뷨õĽ4.9ȷ( )

(A)λ (B)ǧλ (C)ʮλ (D)ǧλ 7 и⣺

122

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