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2025年中考数学专题复习:已知整点个数求取值范围(含解析)_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年中考数学专题复习(通用版,含解析)

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2025年中考数学专题复习:已知整点个数求取值范围(含解析)_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年中考数学专题复习(通用版,含解析)
2025年中考数学专题复习:已知整点个数求取值范围(含解析)_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年中考数学专题复习(通用版,含解析)
2025年中考数学专题复习:已知整点个数求取值范围(含解析)_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年中考数学专题复习(通用版,含解析)
2025年中考数学专题复习:已知整点个数求取值范围(含解析)_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年中考数学专题复习(通用版,含解析)
2025年中考数学专题复习:已知整点个数求取值范围(含解析)_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年中考数学专题复习(通用版,含解析)
2025年中考数学专题复习:已知整点个数求取值范围(含解析)_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年中考数学专题复习(通用版,含解析)
2025年中考数学专题复习:已知整点个数求取值范围(含解析)_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年中考数学专题复习(通用版,含解析)
2025年中考数学专题复习:已知整点个数求取值范围(含解析)_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年中考数学专题复习(通用版,含解析)

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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 已知整点个数求取值范围 方法突破练 1.在平面直角坐标系xOy中,抛物线 y=mx²−2mx+m−3与x轴交于点A,B.若线段AB上(包含端点)有且 只有5个点的横坐标为整数,求m的取值范围. 2.在平面直角坐标系xOy中,我们把横、纵坐标都为整数的点叫做整点.抛物线 y=mx²−2mx−1(m⟩0)与x 轴的交点为A,B,抛物线与线段AB所围成的区域记为 W(不含边界).若区域W内有2个整点,求m的取值范围. 3.在平面直角坐标系xOy中,我们把横、纵坐标都为整数的点叫做整点.抛物线 y=x²−2ax+a²的顶点为 A,直线 y=−x+3与抛物线交于点 B,C(点 B在点 C的左侧),抛物线与线段 BC围成的封闭区域(不含边界)记为 W.若区域W内有2个整点,求a的取值范围. 1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 设问进阶练 例 在平面直角坐标系xOy中,已知抛物线 y=x²−2x+m−2,我们把横、纵坐标都是整数的点叫做整点. (1)若抛物线与直线 y=−x+2所围成的封闭区域 W₁(不含边界)内恰好有4个整点,求m的取值范围; 2 (2)若抛物线与双曲线 y=− 所围成的封闭区域 W₂(不含边界)内有2个整点,求m的取值范围; x (3) 创新题·抛物线旋转考整点将抛物线绕点 M(−1,0)旋转 180°,得到新抛物线 y',,新抛物线 y''与y轴交于 点 C.若线段OC 上的整点个数小于4,求m的取值范围. 2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 综合强化练 1.如图,在平面直角坐标系中,已知抛物线 y=ax²+bx+c与x轴交于O(0,0),A(4,0)两点,与直线 y=kx(k≠0) 交于点 B,抛物线顶点 C 的纵坐标为 −3. (1)求抛物线的解析式; (2)当 k<0且 S =2S 时,求k的值; AOC AOB (3)我们把横、纵坐标均为整数的点叫做整点.将线段OB,OA及抛物线上的AB段围成的封闭区域(不含边界) 记为M,若区域M内恰好没有整点,求k的取值范围. 作图区 答题区 3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.如图,在平面直角坐标系中,正方形 OABC的边OA,OC分别在x轴和y轴的正半轴上,我们把横、纵坐 2 标都为整数的点叫做整点.反比例函数 y= (x⟩0)的图象经过边 BC的中点,已知抛物线 y=−(x−a)²+2a+1. x (1)若抛物线经过点 B,求抛物线的解析式; (2)当抛物线与反比例函数的图象及x轴所围成的封闭区域内恰好只有2个整点(不包含抛物线与坐标轴上的 点),且落在正方形内或边上,求a的取值范围. 作图区 答题区 4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 一阶 方法突破练 1. 解:∵ y=mx²−2mx+m−3=m(x²−2x+1)−3=m(x− 1)²−3, ∴抛物线的顶点坐标为(1,-3),抛物线的对称轴为直线x=1(由二次函数解析式确定顶点坐标及对称轴), ∵线段AB 上有且只有5个点的横坐标为整数, ∴这些整数为-1,0,1,2,3(使区域内整点个数接近题目所给的整点个数), ∵抛物线顶点坐标为(1,-3),且抛物线与x轴相交于点A,B,∴m>0, ∴抛物线与x轴的右边交点横坐标3≤x<4, 当x=3时,y=4m-3≤0,∴m≤3/4, 当x=4时,y=9m-3>0, 1 1 3 ∴m> (找临界点代入解析式中确定字母的取值范围),∴m的取值范围为 0时,直线y=kx过(4,1)时,区域M内没有整点,此时 k= , 4 1 ∴当 k≤ 时,区域M内没有整点, 4 1 1 ∴当 − ≤k<0或 0
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  1. CONNECT:[ UseTime:0.001116s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001663s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000731s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000676s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001363s ]
  6. SELECT * FROM `set` [ RunTime:0.000619s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001675s ]
  8. SELECT * FROM `wendang` WHERE `id` = 329956 LIMIT 1 [ RunTime:0.001546s ]
  9. UPDATE `wendang` SET `liulancishu` = 2 WHERE `id` = 329956 [ RunTime:0.001542s ]
  10. UPDATE `wendang` SET `lasttime` = 1772321527 WHERE `id` = 329956 [ RunTime:0.001325s ]
  11. SELECT * FROM `wendang` WHERE `id` < 329956 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001156s ]
  12. SELECT * FROM `wendang` WHERE `id` > 329956 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001143s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 329956 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006835s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 329956 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002453s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 329956 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002849s ]
0.194702s