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2025年中考数学总复习04微专题分式_02中考总复习(2026版更新中)_02-数学-中考总复习_2025中考复习资料_2025年中考二轮数学总复习微专题学案(含答案)

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2025年中考数学总复习04微专题分式_02中考总复习(2026版更新中)_02-数学-中考总复习_2025中考复习资料_2025年中考二轮数学总复习微专题学案(含答案)
2025年中考数学总复习04微专题分式_02中考总复习(2026版更新中)_02-数学-中考总复习_2025中考复习资料_2025年中考二轮数学总复习微专题学案(含答案)
2025年中考数学总复习04微专题分式_02中考总复习(2026版更新中)_02-数学-中考总复习_2025中考复习资料_2025年中考二轮数学总复习微专题学案(含答案)
2025年中考数学总复习04微专题分式_02中考总复习(2026版更新中)_02-数学-中考总复习_2025中考复习资料_2025年中考二轮数学总复习微专题学案(含答案)
2025年中考数学总复习04微专题分式_02中考总复习(2026版更新中)_02-数学-中考总复习_2025中考复习资料_2025年中考二轮数学总复习微专题学案(含答案)
2025年中考数学总复习04微专题分式_02中考总复习(2026版更新中)_02-数学-中考总复习_2025中考复习资料_2025年中考二轮数学总复习微专题学案(含答案)
2025年中考数学总复习04微专题分式_02中考总复习(2026版更新中)_02-数学-中考总复习_2025中考复习资料_2025年中考二轮数学总复习微专题学案(含答案)
2025年中考数学总复习04微专题分式_02中考总复习(2026版更新中)_02-数学-中考总复习_2025中考复习资料_2025年中考二轮数学总复习微专题学案(含答案)

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关注公众号:陆陆高分冲刺 ~领取:最新版“小中高考-总复习”、最新试卷下载 微专题 04 分 式 考点精讲 构建知识体系 考点梳理 1. 分式的基本概念 A (1)概念:一般地,用A、B表示两个整式,A÷B可以表示成 的形式.如果B中 B A 含有字母,那么称 为分式,其中A称为分式的分子,B称为分式的分母.对于 B 任意一个分式,分母都不能为零 (2)最简分式的概念:① A (3)分式 有意义的条件:② B A (4)分式 的值为0的条件:③ B 2. 分式的基本性质 分式的分子与分母都乘(或除以)同一个不等于0的整式,分式的值④ ; A A·C A A÷C 即 = 通分(C≠0), = 约分(C≠0),其中A,B,C是整式 B B·C B B÷C 3. 分式的运算(6年4考) (1)加减运算 b c ①同分母:分母不变,把分子相加减,即 ± =⑤ ; a a ②异分母:先通分,化为同分母的分式,然后再按同分母分式的加减法法则进 b d 行计算,即 ± = ⑥ ⑦ (关键是通分); a c 1 第 1 页 共 8 页关注公众号:陆陆高分冲刺 ~领取:最新版“小中高考-总复习”、最新试卷下载 ③通分的关键是找最简公分母:分母中能分解因式的先分解因式;取各分母所 有因式的最高次幂的积(数字因式取它们的最小公倍数)作为公分母 (2)乘除运算 b d ①乘法: · =⑧ (关键是约分); a c 2x-1 (5)(x-1)÷(x- )= . x b d ②除法: ÷ = ⑨ ⑩ ; a c ③约分的关键是找公因式:分子、分母中能分解因式的,先分解因式;取分子、 分母中的相同因式的最低次幂(数字因式取它们的最大公约数)作为公因式 a an (3)乘方运算:把分子、分母分别乘方,即( )n= b bn 练考点 1. 下列分式中,是最简分式的是( ) 3x y2 x-1 A. B. x2 x+1 x2+x x-1 C. D. x2-1 x2-2x+1 x+1 2. 已知分式 . x-1 (1)要使该分式有意义,则x的取值范围为 ; (2)要使该分式的值为0,则x的值为 . 3. 下列分式变形从左到右一定成立的是( ) 2x xy x x2 A. = B. = y y2 y y2 -x x 2x 6x C. =- D. = -y y 3 y 9 y 4. 计算: 3 2 (1) + = ; a a 2 (2)1+ = ; x-1 2 第 2 页 共 8 页关注公众号:陆陆高分冲刺 ~领取:最新版“小中高考-总复习”、最新试卷下载 x 2 (3) + = ; 2-x x-2 1 x-1 (4) · = ; x2-x x 高频考点 考点1 分式的概念及性质 a2-1 例1 (人教八上习题改编)若分式 的值为0,则a的值为( ) a-1 A. ±1 B. 0 C. -1 D. 1 x+y 变式1 (人教八上习题改编)若将分式 中的x,y同时扩大为原来的10倍, xy 则该分式的值( ) 1 A. 缩小为原来的 B. 扩大为原来的10倍 10 1 C. 缩小为原来的 D. 不变 100 考点2 分式的运算(6年4考) x-1 x+2 4-x 例2 (北师八下习题改编)先化简:( - )÷ ,再从-1,0,2,4 x-2 x x2-4x+4 四个数中,选择一个合适的数代入求值. 【答题模板】 4-x 解:原式=① ÷ (通分,通分的依据是② x2-4x+4 ) 4-x = ÷ ③ (因式分解) x(x-2) 4-x = · ④ (除法变乘法) x(x-2) =⑤ ,(约分) 要使分式有意义,则x≠0,x-2≠0,⑥ ≠0,即不能选择0,2,4, ∴当x=-1时,代入⑦ 中,得原式=⑧ . 易错警示 (1)一定要“先”化简为最简分式或整式,“再”代入求值; 3 第 3 页 共 8 页关注公众号:陆陆高分冲刺 ~领取:最新版“小中高考-总复习”、最新试卷下载 (2)通分时,不含分母的项也要乘以最简公分母; (3)分数线有括号的作用; (4)代入的数值需使原分式及化简过程中的分式分母不为0. 3(a-2b)+3b 变式2 (2024北京)已知a-b-1=0,求代数式 的值. a2-2ab+b2 x2-2x+1 x-1 变式3 (2024中山二模)先化简 ÷( -x+1)然后从-3<x≤1中选取 x2-1 x+1 一个合适的整数作为x的值代入求值. 真题及变式 命题点 分式化简及求值(6年4考) a 3 1. (2024广东14题3分)计算: - = . a-3 a-3 a2-1 2. (2022广东17题8分)先化简,再求值:a+ ,其中a=5. a-1 x 1 x2-x 3. (2019广东18题6分)先化简,再求值:( - )÷ ,其中x=√2. x-2 x-2 x2-4 新考法 4. [综合与实践](2023盐城改编) 【主题】应用分式的大小比较 【问题提出】课堂上,老师提出了下面的问题: a a+1 已知3a>b>0,M= ,N= ,试比较M与N的大小. b b+3 【类比思考】 整式的大小比较可采用“作差法”. 比如:比较x2+1与2x-1的大小. 4 第 4 页 共 8 页关注公众号:陆陆高分冲刺 ~领取:最新版“小中高考-总复习”、最新试卷下载 ∵(x2+1)-(2x-1)=x2+1-2x+1=(x-1)2+1>0, ∴x2+1>2x-1. 老师:分式的大小比较能用“作差法”吗? … 【实践探索】 (1)请用“作差法”完成老师提出的问题; 23 22 (2)比较大小: (填“>”“=”或“<”). 68 65 5 第 5 页 共 8 页关注公众号:陆陆高分冲刺 ~领取:最新版“小中高考-总复习”、最新试卷下载 考点精讲 ①分子和分母没有公因式的分式 ②B≠0 b±c bc ad ③A=0且B≠0 ④不变 ⑤ ⑥ ± a ac ac bc±ad bd b c bc ⑦ ⑧ ⑨ · ⑩ ac ac a d ad 练考点 1. B 2. (1)x≠1;(2)-1 3. D 5 x+1 1 x 4. (1) ;(2) ;(3)-1;(4) ;(5) a x-1 x2 x-1 高频考点 a2-1 例1 C 【解析】∵分式 的值为0,∴a2-1=0且a-1≠0,解得a=-1. a-1 10x+10 y 1 x+y x+y 变式1 A 【解析】根据题意,得 = · ,∴如果把分式 中 10x×10 y 10 xy xy 1 的x和y同时扩大为原来的10倍,该分式的值缩小为原来的 . 10 x(x-1) (x+2)(x-2) 例2 解:①[ - ];②分式的分子与分母都乘(或除以)同一 x(x-2) x(x-2) 4-x (x-2)2 x-2 个不等于0的整式,分式的值不变;③ ;④ ;⑤ ;⑥4- (x-2)2 4-x x x-2 x;⑦ ;⑧3 x 3a-6b+3b 变式2 解:原式= (a-b)2 3a-3b = (a-b)2 3(a-b) = (a-b)2 3 = , a-b ∵a-b-1=0,∴a-b=1, 6 第 6 页 共 8 页关注公众号:陆陆高分冲刺 ~领取:最新版“小中高考-总复习”、最新试卷下载 ∴原式=3. (x-1)2 x-1 x2-1 变式3 解:原式= ÷( - ) (x+1)(x-1) x+1 x+1 x-1 -x2+x = ÷ x+1 x+1 x-1 x+1 = · x+1 -x(x-1) 1 =- , x ∵(x+1)(x-1)≠0且x(x-1)≠0,∴x≠±1且x≠0, ∵-3<x≤1,∴取x=-2, 1 ∴原式= . 2 真题及变式 a-3 1. 1 【解析】原式= =1. a-3 (a+1)(a-1) 2. 解:原式=a+ (3分) a-1 =a+a+1 =2a+1, (6分) 当a=5时,原式=2×5+1=11. (8分) x-1 x(x-1) 3. 解:原式= ÷ x-2 (x+2)(x-2) x-1 (x+2)(x-2) = · x-2 x(x-1) x+2 = , (4分) x 当x=√2时, √2+2 √2×(√2+2) 原式= = =1+√2. (6分) √2 2 a a+1 4. 解:(1)M-N= - b b+3 a(b+3) b(a+1) = - b(b+3) b(b+3) 7 第 7 页 共 8 页关注公众号:陆陆高分冲刺 ~领取:最新版“小中高考-总复习”、最新试卷下载 ab+3a-ab-b = b(b+3) 3a-b = , b(b+3) ∵3a>b>0, ∴3a-b>0,b(b+3)>0, 3a-b ∴ >0, b(b+3) ∴M>N; 23 22 23×65-22×68 1 23 22 (2)< 【解法提示】 - = =- <0,∴ < . 68 65 68×65 68×65 68 65 8 第 8 页 共 8 页
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  1. CONNECT:[ UseTime:0.000538s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000864s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000399s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000258s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000472s ]
  6. SELECT * FROM `set` [ RunTime:0.000171s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000604s ]
  8. SELECT * FROM `wendang` WHERE `id` = 330041 LIMIT 1 [ RunTime:0.000412s ]
  9. UPDATE `wendang` SET `liulancishu` = 4 WHERE `id` = 330041 [ RunTime:0.001853s ]
  10. UPDATE `wendang` SET `lasttime` = 1772343326 WHERE `id` = 330041 [ RunTime:0.000680s ]
  11. SELECT * FROM `wendang` WHERE `id` < 330041 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000475s ]
  12. SELECT * FROM `wendang` WHERE `id` > 330041 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000424s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 330041 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000968s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 330041 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003197s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 330041 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004253s ]
0.084617s