当前位置:首页>文档>2025年中考数学专题复习:二次函数求整点个数专项练习(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:二次函数求整点个数专项练习(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:二次函数求整点个数专项练习(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:二次函数求整点个数专项练习(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:二次函数求整点个数专项练习(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:二次函数求整点个数专项练习(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:二次函数求整点个数专项练习(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:二次函数求整点个数专项练习(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:二次函数求整点个数专项练习(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:二次函数求整点个数专项练习(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:二次函数求整点个数专项练习(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 二次函数求整点个数专项练习 方法突破练 1.在平面直角坐标系xOy中,我们把横、纵坐标都是整数的点叫做整点.求直线 y=−x+4与坐标轴围成的区 域内(不包括边界)整点的个数. 2.在平面直角坐标系xOy中,我们把横、纵坐标都是整数的点叫做整点.已知抛物线 y=x²+2x,当 −8≤x≤8 时,求抛物线上整点的个数. 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 3.在平面直角坐标系xOy中,我们把横、纵坐标都是整数的点叫做整点.已知抛物线 y=x²−2,将该抛物线与 x轴围成的区域(含边界)记作W,求区域W内整点的个数. 4.在平面直角坐标系xOy中,我们把横、纵坐标都是整数的点叫做整点,把直线 y=x与抛物线 y=x²−x−3 围成的封闭区域(不包含边界)记作W,求区域W内整点的个数. 2 5.在平面直角坐标系xOy中,我们把横、纵坐标都是整数的点叫做整点.把双曲线 y= 与抛物线 x y=−x²+2x+3围成的封闭区域(包含边界)记为W,求区域W内整点的个数. 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 设问进阶练 例 在平面直角坐标系xOy中,已知抛物线 y=x²−4x+3.我们把横、纵坐标都是整数的点叫做整点. (1)将该抛物线与直线 y=x+1l 所围成的封闭区域(不含边界)记为 W₁,求 W₁内整点的个数; (2)将抛物线沿x轴翻折得到新的抛物线y₁,将原抛物线与新 y₁,抛物线围成的封闭区域(包含边界)记为 W₂, 求 W₂内整点的个数; (3) 创新题·抛物线平移求整点将抛物线向左平移1个单位长度,再向下平移2个单位长度后,得到一个新抛物 3 线y₂.将 y₂.新抛物线y₂与双曲线 y₂ y= ,直线 y=3(x≤1))围成的封闭区域(不含边界)记为 W₃,求 W₃内整点的 x 个数. 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 综合强化练 1.在平面直角坐标系中,抛物线 y=ax²+bx+3与x轴交于 A(−1,0),,B 两点,且经过点C(1,4). (1)求抛物线的解析式及点B的坐标; (2)设点M(x,y)为抛物线上一点,当 −3≤x≤8时, m≤ y≤n,求代数式n-m的值; n−m (3)(三种图象围成的区域)我们把横、纵坐标都是整数的点记为整点,抛物线与直线 y=x的上方部分和反比例 1 函数 y= 的图象在第一象限围成的封闭图形中(不含边界)有多少个整点?并写出这些整点的坐标. x 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 7 2.在平面直角坐标系xOy中,抛物线( C₁的解析式为 y=x2− x.我们把横、纵坐标都是整数的点称为整点. 2 (1)求抛物线( C₁与x轴围成的封闭区域(包含边界)内整点的个数; (2)(两条抛物线围成的区域)若抛物线 C₁关于原点对称的抛物线为( C₂. ①求抛物线( C₂的函数表达式; ②直线 y=−1分别与 C₁,C₂围成两个封闭的区域W和G,求封闭区域W和G(不含边界)内整点个数的比. 作图区 答题区 5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:令x=0,得y=4,令y=0,得x=4, ∴直线y=-x+4 与坐标轴围成的区域内(不包括边界)整点的个数,即为0|1-(-3)|, ∴当x=8时,y取得最小值,∴m=-45,∴n-m=49; 1 (3)如解图,画出抛物线 y=−x²+2x+3与直线y=x,反比例函数 y= 的图象(根据函数的解析式画出函数图 x 象),在封闭区域内有(1,2),(1,3)两个整点(选区域内为整数的横坐标,确定纵坐标可以取整数的点). 1 ∴抛物线与直线y=x的上方部分和反比例函数 y= 的图象在第一象限围成的封闭图形中(不含边界)整点个数 x 为2个,整点坐标为(1,2),(1,3). 7 2.解:(1)如解图①,画出函数 y=x2− x的图象,由解图可知,抛物线 C₁ 与x 轴围成的封闭区域(包含边界)内 2 的整点有(0,0),(1,0),(1,-1),(1,-2),(2,0),(2,-1),(2,-2),(2,-3),(3,0),(3,-1),∴抛物线C₁与x轴围成的封闭区域内的整点 个数为10个; 7 (2)①∵抛物线 C₂ 与抛物线 C₁ 关于原点对称,∴抛物线C₂的函数表达式为 y=−x2− x; 2 ②如解图②,画出抛物线C₁,C₂及直线y=-1,由解图可知区域 W(不含边界)内的整点有(1,-2),(2,-2)共2个,区 域G(不含边界)内的整点有(-3,0),(-3,1),(-2,0),(-2,1),(-2,2),(-1,0),(-1,1),(-1,2)共8个,∴封闭区域W和G内(不含边 界)整点个数的比为1:4. 8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 9
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  1. CONNECT:[ UseTime:0.001128s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001577s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000686s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000810s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001407s ]
  6. SELECT * FROM `set` [ RunTime:0.000640s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001491s ]
  8. SELECT * FROM `wendang` WHERE `id` = 329945 LIMIT 1 [ RunTime:0.001047s ]
  9. UPDATE `wendang` SET `liulancishu` = 2 WHERE `id` = 329945 [ RunTime:0.003415s ]
  10. UPDATE `wendang` SET `lasttime` = 1772321549 WHERE `id` = 329945 [ RunTime:0.001338s ]
  11. SELECT * FROM `wendang` WHERE `id` < 329945 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001473s ]
  12. SELECT * FROM `wendang` WHERE `id` > 329945 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001258s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 329945 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002722s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 329945 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002935s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 329945 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006124s ]
0.196309s