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专题四代数推理题(2024年新增题型)学案(含答案)2025年中考数学人教版一轮复习_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

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专题四代数推理题(2024年新增题型)学案(含答案)2025年中考数学人教版一轮复习_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
专题四代数推理题(2024年新增题型)学案(含答案)2025年中考数学人教版一轮复习_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
专题四代数推理题(2024年新增题型)学案(含答案)2025年中考数学人教版一轮复习_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
专题四代数推理题(2024年新增题型)学案(含答案)2025年中考数学人教版一轮复习_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
专题四代数推理题(2024年新增题型)学案(含答案)2025年中考数学人教版一轮复习_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

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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 专题四 代数推理题(2024 年新增题型) 人教版七年级下册数学课本第58页的“阅读与思考”:为什么说 不是有理数? √2 (1)【阅读与思考】 p 假设√2是有理数,那么存在两个互质的正整数p和q,使得√2= , q 两边平方得2=(p) 2 , q 即p2= .① 故p2是偶数,因为只有偶数的平方才是偶数,所以p也是偶数. 设p=2s,代入①中,得 , 即q2= , 所以q也是偶数,则p和q都是偶数,不互质,这与假设p和q互质矛盾. 这个矛盾说明,√2不能写成分数的形式,即√2不是有理数. (2)【运用并解决】 类比上述的阅读与思考,推理说明√32不是有理数. 1.数学兴趣小组开展探究活动,研究了“正整数N能否表示为x2-y2(x,y均为自然数)”的问题. (1)指导教师将学生的发现进行整理,部分信息如下(n为正整数): N 奇数 4的倍数 1=12-02 4=22-02 3=22-12 8=32-12 5=32-22 12=42-22 表示结果 7=42-32 16=52-32 9=52-42 20=62-42 …… …… 一般结论 2n-1=n2-(n-1)2 4n= 按上表规律,完成下列问题: 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 ①24=( )2-( )2; ②4n= . (2)兴趣小组还猜测:像2,6,10,14,…这些形如4n-2(n为正整数)的正整数N不能表示为x2-y2(x,y均 为自然数).师生一起研讨,分析过程如下: 假设4n-2=x2-y2,其中x,y均为自然数. 分下列三种情形分析: ①若x,y均为偶数,设x=2k,y=2m,其中k,m均为自然数,则x2-y2=(2k)2-(2m)2=4(k2-m2)为4的倍数, 而4n-2不是4的倍数,矛盾.故x,y不可能均为偶数; ②若x,y均为奇数,设x=2k+1,y=2m+1,其中k,m均为自然数, 则x2-y2=(2k+1)2-(2m+1)2= 为4的倍数,而4n-2不是4的倍数,矛盾.故x,y不可能均为奇 数; ③若x,y一个是奇数一个是偶数,则x2-y2为奇数. 而4n-2是偶数,矛盾.故x,y不可能一个是奇数一个是偶数. 由①②③可知,猜测正确. 阅读以上内容,请在情形②的横线上填写所缺内容. 用代数推理的方法证明下列两个结论: (1)设abcd是一个四位数,若a+b+c+d可以被3整除,则这个数可以被3整除. (2)已知函数y=x2.求证:当x>0时,y随x的增大而增大. 2.对于任意一个三位正整数,十位上的数字减去个位上的数字之差恰好等于百位上的数字,则称这 个三位数为“极差数”.例如:对于三位数451,5-1=4,则451是“极差数”;对于三位数110,1-0=1, 则110是“极差数”.求证:任意一个“极差数”一定能被11整除. 3.一个十位上的数字不为0的三位数m,若将m的百位数字与十位数字相加,所得和的个位数字放 在m的个位数字右边,与m一起组成一个新的四位数,则把这个新四位数称为m的“生成数”.若 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 再将m的“生成数”的任意一个数位上的数字去掉,可以得到四个三位数,则把这四个三位数之 和记为S(m).例如:m=558,∵5+5=10,∴558的“生成数”是5580.将5580的任意一个数位上的数字 去掉后得到的四个三位数是580,580,550,558,则S(m)=580+580+550+558=2268. (1)写出123的“生成数”,并求S(123)的值. (2)说明S(m)一定能被3整除. 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 参考答案 例1 解析:(1)2q2;4s2=2q2;2s2. p 提示:假设√2是有理数,那么存在两个互质的正整数p和q,使得√2= , q 两边平方得2=(p) 2 , q 即p2=2q2.① 故p2是偶数,因为只有偶数的平方才是偶数,所以p也是偶数. 设p=2s,代入①中,得4s2=2q2, 即q2=2s2. 所以q也是偶数,则p和q都是偶数,不互质,这与假设p和q互质矛盾. 这个矛盾说明,√2不能写成分数的形式,即√2不是有理数. p (2)假设√32是有理数,那么存在两个互质的正整数p和q,使得√32= , q 两边立方得2=(p) 3 , q 即p3=2q3.① 故p3是偶数,因为只有偶数的立方才是偶数,所以p也是偶数. 设p=2s,代入①中,得8s3=2q3. 即q3=4s3, 所以q也是偶数,则p和q都是偶数,不互质,这与假设p和q互质矛盾. 这个矛盾说明,√32不能写成分数的形式,即√32不是有理数. 针对训练 1.解析:(1)①7;5. ②(n+1)2-(n-1)2. (2)4(k2-m2+k-m). 例2 解析:(1)abcd=1000a+100b+10c+d =(999a+99b+9c)+(a+b+c+d) =3(333a+33b+3c)+(a+b+c+d). 显然3(333a+33b+3c)能被3整除,因此,如果(a+b+c+d)能被3整除,那么abcd就能被3整除. (2)设x>x>0,则y= ,y= , 1 2 1 x2 2 x2 1 2 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 y-y= - =(x +x)(x-x). 1 2 x2 x2 1 2 1 2 1 2 ∵x>x>0, 1 2 ∴x+x>0,x-x>0, 1 2 1 2 ∴(x +x)(x-x)>0, 1 2 1 2 ∴y>y,即当x>0时,y随x的增大而增大. 1 2 针对训练 2.证明:设任意一个“极差数”的百位数字是a,十位数字是b,个位数字是c, ∵a=b-c, ∴100a+10b+c=100b-100c+10b+c=110b-99c=11(10b-9c), ∴100a+10b+c能被11整除, ∴任意一个“极差数”一定能被11整除 针对训练 3.解析:(1)依题意123的“生成数”为1233, 得另四个三位数:233,133,123,123, ∴S(123)=233+133+123+123=612. (2)设m的百位数字、十位数字、个位数字分别为a,b,c(都是整数), 由题意得2≤a+b≤18. 当2≤a+b≤9时, 由m的“生成数”得到四个三位数为 100b+10c+a+b,100a+10c+a+b,100a+10b+a+b,100a+10b+c, ∴S(m)=303a+123b+21c=3(101a+41b+7c), 即S(m)能被3整除. 当10≤a+b≤18时,由m的“生成数”得到四个三位数为 100b+10c+a+b-10,100a+10c+a+b-10,100a+10b+a+b-10,100a+10b+c, ∴S(m)=303a+123b+21c-30, 即S(m)=3(101a+41b+7c-10), ∴S(m)也能被3整除. 综上所述,S(m)一定能被3整除. 5
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  1. CONNECT:[ UseTime:0.000896s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000804s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002140s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000313s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000478s ]
  6. SELECT * FROM `set` [ RunTime:0.002069s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000635s ]
  8. SELECT * FROM `wendang` WHERE `id` = 366160 LIMIT 1 [ RunTime:0.005313s ]
  9. UPDATE `wendang` SET `liulancishu` = 2 WHERE `id` = 366160 [ RunTime:0.009020s ]
  10. UPDATE `wendang` SET `lasttime` = 1773049395 WHERE `id` = 366160 [ RunTime:0.000402s ]
  11. SELECT * FROM `wendang` WHERE `id` < 366160 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000598s ]
  12. SELECT * FROM `wendang` WHERE `id` > 366160 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000461s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 366160 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001589s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 366160 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.010505s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 366160 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007587s ]
0.190885s