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精品解析:北京市徐悲鸿中学2021-2022学年七年级上学期期中数学试题(原卷版)(1)_北京初中期末题_C605-京七八九_B京市数学七八九_北京7上数学_2021-2022

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精品解析:北京市徐悲鸿中学2021-2022学年七年级上学期期中数学试题(原卷版)(1)_北京初中期末题_C605-京七八九_B京市数学七八九_北京7上数学_2021-2022
精品解析:北京市徐悲鸿中学2021-2022学年七年级上学期期中数学试题(原卷版)(1)_北京初中期末题_C605-京七八九_B京市数学七八九_北京7上数学_2021-2022
精品解析:北京市徐悲鸿中学2021-2022学年七年级上学期期中数学试题(原卷版)(1)_北京初中期末题_C605-京七八九_B京市数学七八九_北京7上数学_2021-2022
精品解析:北京市徐悲鸿中学2021-2022学年七年级上学期期中数学试题(原卷版)(1)_北京初中期末题_C605-京七八九_B京市数学七八九_北京7上数学_2021-2022
精品解析:北京市徐悲鸿中学2021-2022学年七年级上学期期中数学试题(原卷版)(1)_北京初中期末题_C605-京七八九_B京市数学七八九_北京7上数学_2021-2022
精品解析:北京市徐悲鸿中学2021-2022学年七年级上学期期中数学试题(原卷版)(1)_北京初中期末题_C605-京七八九_B京市数学七八九_北京7上数学_2021-2022

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2021 北京徐悲鸿中学初一(上)期中数学 一、选择题(本题共30分,每小题3分) 1. 3的相反数为( ) A. ﹣3 B. ﹣ C. D. 3 2. 我国第一艘航母“辽宁舰”最大排水量为67500吨,将67500用科学记数法可表示为( ) A. 6.75×103 B. 67.5×103 C. 6.75×104 D. 6.75×105 3. 如图所示,点M表示的数是( ) A. 2.5 B. ﹣1.5 C. ﹣2.5 D. 1.5 4. 下列是一元一次方程的是( ) A. B. x+3y=5 C. D. 5. 下列计算中,正确的是( ) A. B. C. D. 6. 下列各式中,是同类项的是( ) A. 与 B. 与 C. 与 D. 与 的 7. 下列各式中,去括号正确 是( ) A. B. C. D. 8. 运用等式的性质进行变形,正确的是( ).A. 如果 , 那么 B. 如果 , 那么 C. 如果 , 那么 D. 如果 , 那么 的 9. a、b是有理数,它们在数轴上 对应点的位置如图所示,把a、-a、b、-b按从小到大的顺序排 列为( ) A. -b<-a<a<b B. -a<-b<a<b C. -b<a<-a<b D. -b<b<-a<a 10. 下面四个整式中,不能表示图中阴影部分面积的是( ) A. B. C. D. 二、填空题(本题共20分,每小题2分) 11. 如果水位升高3m时,水位变化记作 ,那么水位下降3m时,水位变化记作______ 12. 将5.249精确到0.1所得的近似数是______. 13. 写出一个次数为5,系数为负数,所含字母只有x、y的单项式是_______. 14. 多项式 是____次____项式. 15. 比较大小: ________ (填入“>”“=”“<”) 16. 已知x=2是关于x的方程 的解,则k的值为________.17. 若 ,则 ________. 18. 用“☆”定义新运算:对于任意有理数 、 ,都有 ,例 那么 ______. 19. 已知多项式 ,则多项式 的值是_________. 20. 如图是一组有规律的图案,第1个图形(如图1)由4个▲组成,第2个图形(如图2)由7个▲组成, 第3个图形(如图3)由10个▲组成,第4个图形(如图4)由13个▲组成,……,则第6个图形由_____ 个▲组成,第n(n为正整数)个图形由______个▲组成. 三、计算题(本题共16分,每小题4分) 21. 23−17−(−7)+(−16) 22. 23. . 24. 四、解答题(本题共18分,25-26每小题4分,27-28每小题5分) 25. 化简: . 26. 化简: . 27. 先化简,再求值:a2+(5a2﹣2a)﹣2(a2﹣3a),其中a=﹣5.28. 利用等式性质补全下列解方程过程: 解:根据等式性质1,两边同时 , 可得 _________, 于是 _________. 根据____________两边同时乘以-3,可得 =_______. 五、解答题(本题共16分,29题5分,30题5分,31题6分) 29. 有 筐白菜,以每筐 千克为标准,超过的千克数记作正数,不足的千克数记作负数,称后的纪录如 下: 、 、 、 、 、 、 、 回答下列问题: (1)这 筐白菜中,最接近 千克的那筐白菜为_____千克; (2)以每筐 千克为标准,这8筐白菜总计超过多少千克或不足多少千克? (3)若白菜每千克售价2.6元,则出售这8筐白菜可卖多少元? 30. 如图1是一个长为2 ,宽为2b的长方形,沿图中虚线用剪刀平均分成四个小长方形,然后按照图2 的方式拼成一个大正方形.的 (1)图2中,中间空白正方形 边长等于 . (2)请用两种不同的方法表示图2中空白正方形的面积: 方法1 ;方法2 . (3)比较(2)中的方法1和方法2,试写出 , , 这三个代数式之间的等量关系: . (4)若 , ,请利用(3)中的结论,求 的值. 31. 结合数轴与绝对值的知识回答下列问题: 的 (1)数轴上表示4和1 两点之间的距离是3;数轴上表示 和2两点之间的距离是 ; 一般地,数轴上表示数m和数n的两点之间的距离等于 . 如:数轴上数x与5两点之间的距离等于 , (2)如果表示数 和 的两点之间的距离是3,那么 ; (3)若数轴上表示数 的点位于 与2之间,则 的值为 ; (4)当 = 时, 的值最小,最小值是 .
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  1. CONNECT:[ UseTime:0.000949s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001498s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000726s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000648s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001281s ]
  6. SELECT * FROM `set` [ RunTime:0.000514s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001430s ]
  8. SELECT * FROM `wendang` WHERE `id` = 358124 LIMIT 1 [ RunTime:0.000931s ]
  9. UPDATE `wendang` SET `liulancishu` = 6 WHERE `id` = 358124 [ RunTime:0.035823s ]
  10. UPDATE `wendang` SET `lasttime` = 1773080100 WHERE `id` = 358124 [ RunTime:0.005556s ]
  11. SELECT * FROM `wendang` WHERE `id` < 358124 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002043s ]
  12. SELECT * FROM `wendang` WHERE `id` > 358124 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002491s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 358124 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002300s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 358124 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.007934s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 358124 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003397s ]
0.162766s