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2025年中考数学总复习44微专题反比例函数综合题学案(含答案)_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44微专题反比例函数综合题学案(含答案)_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44微专题反比例函数综合题学案(含答案)_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44微专题反比例函数综合题学案(含答案)_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44微专题反比例函数综合题学案(含答案)_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44微专题反比例函数综合题学案(含答案)_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44微专题反比例函数综合题学案(含答案)_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44微专题反比例函数综合题学案(含答案)_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44微专题反比例函数综合题学案(含答案)_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44微专题反比例函数综合题学案(含答案)_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44微专题反比例函数综合题学案(含答案)_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 44 反比例函数综合题 3 1. 如图,已知点A(1,m)、B(n,1)在反比例函数y= (x>0)的图象上, x 过点A的一次函数y=kx+b的图象与y轴交于点C(0,1). (1)求m、n的值和一次函数的表达式; (2)连接AB,求点C到线段AB的距离. 第1题图 3 k 2. 如图,已知一次函数y = x-3的图象与反比例函数y = 的图象相交于点A 1 2 2 x (4,n),与x轴相交于点B. (1)求n和k的值; (2)以AB为边作菱形ABCD,使点C在x轴正半轴上,点D在第一象限,双 曲线交CD于点E,连接AE,BE,求△ABE的面积. 第2题图 1 第 1 页 共 10 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. 如图,点A是第一象限内直线y=2x上一点,过点A作AB⊥x轴于点B (a,0)(a>0),将△ABO绕点A逆时针旋转90°得到△ACD,点B的对应点 k C恰好落在反比例函数y= (k≠0,x>0)的图象上. x (1)若AO=2√5,求k的值; k (2)设直线y=2x与反比例函数y= (k≠0,x>0)的图象交于点P,且点P x m 横坐标为m.求证: 为定值. a 第3题图 1 4. 如图,一次函数y=- x+2的图象交x轴于点A,交y轴于点B,C为AB的 2 k 中点,双曲线的一支y= (x>0)过点C,连接OC,将线段OC沿着y轴向上 x k 平移至EF,线段EF交y= (x>0)的图象于点D. x (1)求该反比例函数的表达式; (2)若DE∶DF=1∶2,求点D的坐标. 2 第 2 页 共 10 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 第4题图 5. 如图,Rt△OAB的顶点A的坐标为(2,2),∠ABO=90°,且点B在x轴 k 1 上,反比例函数y= (x>0)的图象经过点E(2, )且与AO相交于点D,点 x 2 C与点O关于点B对称,连接AC,BD,作直线DE. (1)试判断BD与AC的位置关系和数量关系,并说明理由; (2)求直线DE的表达式和△BDE的面积. 第5题图 6. 如图,在平面直角坐标系xOy中,矩形OABC的边OA,OC分别在y轴和x k 轴上,点D为AB边上的动点(不与点A,B重合),过点D的反比例函数y= x (k>0,x>0)的图象与BC交于点E,连接OD,OE,DE. (1)设S =S ,S =S ,当S +S =3时,求该反比例函数的表达式; △AOD 1 △OEC 2 1 2 (2)若OA=6,AB=8,记S=S -S ,求出S的最大值; △ODE △BDE 3 第 3 页 共 10 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)在(2)的条件下,是否存在点D,使得△BDE沿直线DE折叠后点B的对 应点B'恰好落在OC边上?若存在,求出点D的坐标;若不存在,请说明理由. 第6题图 备用图 4 第 4 页 共 10 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 1. 解:(1)∵点A(1,m),B(n,1)在反比例函数y= 的图象上, x ∴m=3,n=3. 又∵一次函数y=kx+b的图象过点A(1,3),C(0,1), {k+b=3, {k=2, ∴ 解得 b=1. b=1. ∴一次函数的表达式为y=2x+1; (2)如解图,连接BC,过点A作AD⊥BC,垂足为D,过点C作CE⊥AB,垂足 为E. ∵C(0,1),B(3,1), ∴BC∥x轴,BC=3. ∵点A(1,3),B(3,1),AD⊥BC于点D, ∴点D(1,1),AD=2,DB=2. 在Rt△ADB中,AB=√AD2+DB2=2√2. 1 1 又∵S = BC·AD= AB·CE, △ABC 2 2 1 1 即 ×3×2= ×2√2·CE, 2 2 3√2 3√2 ∴CE= ,即点C到线段AB的距离为 . 2 2 第1题解图 3 3 2. 解:(1)把A点坐标代入y = x-3中,得n= ×4-3=3, 1 2 2 ∴A(4,3), ∵A点在反比例函数图象上, ∴k=3×4=12; (2)如解图,过点A作AH⊥BC,垂足为H,连接AC, 5 第 5 页 共 10 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 ∵A(4,3),∴AH=3, 3 当y =0时,得 x-3=0, 1 2 解得x=2, ∴点B的坐标为(2,0), ∴AB=√(4-2)2+(3-0)2=√13, ∵四边形ABCD是菱形, ∴AB=BC=√13,AB∥CD, 1 1 3√13 ∴S =S = BC·AH= ×√13×3= . △ABE △ABC 2 2 2 第2题解图 3. (1)解:∵AB⊥x轴于点B(a,0),点A是直线y=2x上一点, ∴A(a,2a), ∴OB=a,AB=2a, 在Rt△ABO中, ∵AO=2√5,AB2+OB2=AO2, ∴(2a)2+a2=(2√5)2, 解得a=2(负值已舍去), ∴AB=4,BO=2, 根据旋转的性质,得AC=AB=4,∠ACD=∠ABO=90°, ∴C(6,4), k ∵点C在反比例函数y= 图象上, x ∴k=6×4=24; (2)证明:由旋转可得OB=CD=a,由(1)知A(a,2a), ∴AC=AB=2a, 6 第 6 页 共 10 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 ∴点C的坐标为(3a,2a), ∴k=2a·3a=6a2. k ∵直线y=2x与反比例函数y= (k≠0,x>0)的图象交于点P,点P的横坐标为 x m, 6a2 m2 ∴2m= ,即 =3. m a2 由题意得,点P在第一象限内, ∴m>0且a>0, m ∴ =√3, a m ∴ 为定值. a 1 4. 解:(1)在一次函数y=- x+2中,当x=0时,y=2,当y=0时,x=4, 2 1 ∴一次函数y=- x+2的图象交x轴于点A(4,0),交y轴于点B(0,2), 2 ∵C为AB的中点, ∴点C(2,1), k ∵点C(2,1)在反比例函数y= (x>0)的图象上, x ∴k=2×1=2, 2 ∴反比例函数的表达式为y= ; x (2)如解图,连接FC,过点D作x轴的平行线与FC交于点N,与y轴交于点 M, 由题意可得FC∥y轴, ∴△EMD∽△FND, MD DE 1 ∴ = = , ND DF 2 1 1 2 ∴MD= MN= ×2= , 3 3 3 7 第 7 页 共 10 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 即点D的横坐标为 , 3 ∵点D在反比例函数图象上, 2 2 ∴当x= 时,y=2=3, 3 3 2 ∴点D( ,3). 3 第4题解图 1 5. 解:(1)BD∥AC,BD= AC.理由如下: 2 k 1 ∵反比例函数y= 的图象经过点E(2, ), x 2 1 ∴k=2× =1, 2 1 ∴反比例函数的表达式为y= . x 又∵点A的坐标为(2,2), 1 ∴OA所在直线表达式为y=x,令y= ,解得x=1或x=-1(舍去), x ∴D(1,1), ∴点D为OA的中点, ∵点C与点O关于点B对称, ∴点B为OC的中点,即BD为△AOC的中位线, 1 ∴BD∥AC,BD= AC; 2 (2)设直线DE的表达式为y=ax+b(a≠0), 1 将D(1,1),E(2, )分别代入, 2 8 第 8 页 共 10 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 1 { a+b=1 {a=- 2 得 1,解得 , 2a+b= 3 2 b= 2 1 3 ∴直线DE的表达式为y=- x+ . 2 2 ∵点A的坐标为(2,2),∠ABO=90°,点B在x轴上, ∴点B的坐标为(2,0), 1 ∴BE= , 2 1 1 1 1 ∴S = BE×(|x |-|x |)= × ×(2-1)= . △BDE 2 E D 2 2 4 k 6. 解:(1)∵点D,E在反比例函数y= (k>0,x>0)的图象上, x k k ∴设D(x , ),E(x , ),x >0,x >0,x >x , 1 x 2 x 1 2 2 1 1 2 1 k k 1 k k ∴S = x · = ,S = x · = . 1 2 1 x 2 2 2 2 x 2 1 2 ∵S +S =3, 1 2 k k ∴ + =3, 2 2 ∴k=3, 3 ∴反比例函数的表达式为y= (x>0); x k k (2)由题意得,D( ,6),E(8, ), 6 8 1 1 1 1 ∴S = BD·BE= (8- k)(6- k), △BDE 2 2 6 8 1 1 ∴S =S -S -S -S =6×8- k- k-S =48-k-S , △ODE 矩形OABC △AOD △COE △BDE 2 2 △BDE △BDE 1 1 1 ∴S=S -S =48-k-2S =48-k-2× (8- k)(6- k), △ODE △BDE △BDE 2 6 8 1 ∴S=- k2+k. 48 1 ∵- <0, 48 9 第 9 页 共 10 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 1 1 ∴当k=- 1 =24时,S有最大值,最大值为- ×242+24=12; 2×(− ) 48 48 (3)存在.如解图,过点D作DF⊥OC于点F. 1 1 由题意得,DF=AO=6,DB=DB'=8- k,B'E=BE=6- k,∠DB'E=∠B= 6 8 ∠C=90°, ∴∠DB'F+∠EB'C=∠EB'C+∠B'EC=90°, ∴∠DB'F=∠B'EC. 又∵∠DFB'=∠B'CE=90°, ∴△DFB'∽△B'CE, DF DB' ∴ = , B'C B'E 1 1 8- k 8(1- k) 6 6 48 ∴ = = , B'C 1 1 6- k 6(1- k) 8 48 9 ∴B'C= . 2 ∵B'C2+CE2=B'E2, 9 k 1 21 ∴( )2+( )2=(6- k)2,解得k= , 2 8 8 2 k 25 ∴DB'=DB=8- = , 6 4 7 ∴AD=AB-DB= , 4 7 ∴存在符合条件的点D,点D的坐标为( ,6). 4 第6题解图 10 第 10 页 共 10 页
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  1. CONNECT:[ UseTime:0.000650s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000701s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000242s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000314s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000614s ]
  6. SELECT * FROM `set` [ RunTime:0.000231s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000661s ]
  8. SELECT * FROM `wendang` WHERE `id` = 330054 LIMIT 1 [ RunTime:0.000575s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 330054 [ RunTime:0.001413s ]
  10. UPDATE `wendang` SET `lasttime` = 1772374298 WHERE `id` = 330054 [ RunTime:0.000631s ]
  11. SELECT * FROM `wendang` WHERE `id` < 330054 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000513s ]
  12. SELECT * FROM `wendang` WHERE `id` > 330054 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000466s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 330054 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002104s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 330054 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001878s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 330054 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001844s ]
0.092994s