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精品解析:北京市顺义区2019-2020学年七年级下学期期末数学试题(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下数学_2019-2020

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精品解析:北京市顺义区2019-2020学年七年级下学期期末数学试题(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下数学_2019-2020
精品解析:北京市顺义区2019-2020学年七年级下学期期末数学试题(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下数学_2019-2020
精品解析:北京市顺义区2019-2020学年七年级下学期期末数学试题(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下数学_2019-2020
精品解析:北京市顺义区2019-2020学年七年级下学期期末数学试题(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下数学_2019-2020
精品解析:北京市顺义区2019-2020学年七年级下学期期末数学试题(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下数学_2019-2020

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北京市顺义区 2019-2020 学年七年级下学期期末数学试题 一、选择题 的 1. 若a>b,则下列不等式成立 是( ) A. a﹣3<b﹣3 B. ﹣2a>﹣2b C. D. 2. 一个不等式组中的两个不等式的解集如图所示,则这个不等式组的解集为( ) A. ﹣1<x≤2 B. ﹣1≤x<2 C. ﹣1<x<2 D. 无解 3. 不等式组 的最大整数解为( ) A. ﹣2 B. ﹣1 C. 0 D. 1 4. 二元一次方程组 的解是【 】 A. B. C. D. 5. 下列式子从左到右变形是因式分解的是( ) A. B. C. D. 6. 下列运算中,正确的是 A. a2+a3=a5 B. a6÷a3=a2 C. (a4)2=a6 D. a2•a3=a5 7. 空气的密度为0.00129g/cm3,0.00129这个数用科学记数法可表示为( ) A. 0.129×10﹣2 B. 1.29×10﹣2 C. 1.29×10﹣3 D. 12.9×10﹣1 8. 已知锐角α,那么∠α的补角与∠α的余角的差是( ) 学科网(北京)股份有限公司A. 90° B. 120° C. 60°+α D. 180°﹣α 9. 计算(﹣0.25)2020×(﹣4)2019的结果是( ) A. ﹣4 B. 4 C. ﹣ D. 10. 将代数式x2+6x+2化成(x+p)2+q的形式为( ) A. (x-3)2+11 B. (x+3)2-7 C. (x+3)2-11 D. (x+2)2+4 二、填空题(本题共20分,每小题2分) 11. 分解因式:mn2﹣4mn+4m=_____. 12. 二元一次方程3x+2y=7的正整数解是_____. 的 13. 如果2a3xby与﹣a2ybx+1是同类项,则代数式5x﹣2y 值是_____. 14. 如图,与∠1是同旁内角的是_____,与∠2是内错角的是_____. 15. 《孙子算经》中有一道题:“今有木,不知长短,引绳度之,余绳四尺五寸;屈绳量之,不足一尺,木 长几何?”译文大致是:“用一根绳子去量一根木条,绳子剩余 尺;将绳子对折再量木条,木条剩余 尺, 问木条长多少尺?”如果设木条长 尺,绳子长 尺,可列方程组为_____. 16. 如图,边长为a的正方形中有一个边长为b的小正方形,若将图1的阴影部分拼成一个长方形,如图 2,比较图1和图2的阴影部分的面积,你能得到的公式是______________. 17. 已知x,y是有理数,且满足|2x﹣y+1|+(5x﹣2y﹣3)2=0,则x=_____,y=_____. 18. 有4人携带会议材料乘坐电梯,这4人的体重共300千克,每捆材料重20千克,电梯最大负荷为1050 千克,则该电梯在此4人乘坐的情况下最多还能搭载____ 捆材料. 学科网(北京)股份有限公司19. 已知关于 的不等式组 无解,则 的取值范围是________ 20. 如图所示是一组有规律的图案,第l个图案由4个基础图形组成,第2个图案由7个基础图形组成, ……,第n(n是正整数)个图案中的基础图形个数为_______ (用含n的式子表示). 三、解答题(本题共60分,第21-24题,每小题5分,第25-29题,每小题5分,第30题8 分,第31,32题,每小题5分)解答应写出文字说明、演算步骤或证明过程. 21. 计算:﹣22+|﹣3|﹣(2020﹣π)0+( )﹣2. 22. 解不等式: ,并把解集表示在数轴上. 23. 解二元一次方程组: . 24. 已知:如图,直线AB,CD相交于点O,OE⊥CD于点O,∠BOD=40°.求∠AOE的度数. 25. 计算:9m2﹣4(2m2﹣3mn+n2)+4n2. 26. 计算:(12x3﹣18x2+6x)÷(﹣6x). 27. 根据题目条件填空,并注明根据.如图,四边形ABCD,点E是AB的延长线上的一点. (1)如果∠CBE=∠A, 那么可以判定直线 // , 根据 是 ; (2)如果直线DC//AB, 那么可以判定∠ =∠ , 学科网(北京)股份有限公司根据 是 . 28. 边长分别为a和2a的两个正方形按如图的样式摆放,求图中阴影部分的面积. 29. 已知a是一个正数,比较( )﹣1,( )0, 大小. 的 30. 先化简,再求值:(2x+3)(2x﹣3)﹣4x(x﹣1)+(x﹣2)2,其中x=3. 31. 已知:如图,DE//BC,∠1=∠2.求证:BE//FG. 32. 某商场用36000元购进甲、乙两种商品,销售完后共获利6000元.其中甲种商品每件进价120元,售 价138元;乙种商品每件进价100元,售价120元. (1)该商场购进甲、乙两种商品各多少件? (2)商场第二次以原进价购进甲、乙两种商品,购进乙种商品的件数不变,而购进甲种商品的件数是第 一次的2倍,甲种商品按原售价出售,而乙种商品打折销售.若两种商品销售完毕,要使第二次经营活动 获利不少于8160元,乙种商品最低售价为每件多少元? 学科网(北京)股份有限公司学科网(北京)股份有限公司
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  1. CONNECT:[ UseTime:0.000806s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000853s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000360s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000281s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000653s ]
  6. SELECT * FROM `set` [ RunTime:0.000207s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000662s ]
  8. SELECT * FROM `wendang` WHERE `id` = 366974 LIMIT 1 [ RunTime:0.002187s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 366974 [ RunTime:0.012357s ]
  10. UPDATE `wendang` SET `lasttime` = 1773060149 WHERE `id` = 366974 [ RunTime:0.000649s ]
  11. SELECT * FROM `wendang` WHERE `id` < 366974 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000639s ]
  12. SELECT * FROM `wendang` WHERE `id` > 366974 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000629s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 366974 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.014496s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 366974 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002125s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 366974 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002259s ]
0.110668s