河南省洛阳市西工区2021-2022学年下学期七年级数学期中考试 (含答案)练习题
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这是一份河南省洛阳市西工区2021-2022学年下学期七年级数学期中考试 (含答案)练习题,共9页。试卷主要包含了 B2, C9, 解等内容,欢迎下载使用。
西工区2021-2022学年第二学期质量检测七年级数学参考答案1. 2. 3. 4. 5. 6. 7.
8. 9. 10. 11. 答案不唯一 12. 垂线段最短 13. 14. 同位角相等,两直线平行 15. 16.(每小题5分) 解:原式·······································3分; ···········································5分(2) 原式·······························4分. ·····································5分17. 解:,平分,
,
;····················4分
设,则,,解得,
则,
又平分,, . ··8分18. 解:点在轴上,
, 解得,
所以,,
所以,点的坐标为;··················2分
点的纵坐标比横坐标大,
,解得,
,
,
所以,点的坐标为;················5分
点到轴的距离为,
,解得或,
当时,,
,此时,点,
当时,,
,此时,点,
点在第四象限,点的坐标为. ············8分19. 已知 两直线平行,同位角相等 等量代换 同旁内角互补,两直线平行 ···············································(每空2分)20. 解:;···················2分
是的整数部分,是的小数部分,
,
则
,,············7分
. ·························9分21. 证明:、分别是和的平分线,
,,(角平分线定义),,·················4分,,(等量代换). (内错角相等,两直线平行。)···········10分不注明理由的最多扣1分。(1)图略,·····················2分S△ABC (过程要正确合理)···········5分(2)向右平移个单位,再向下平移个单位得到, ······················7分P( , )。·····················9分23. 解:补全图形如图;
······················2分
.;······················4分
.·························5分
证明:如图,延长交于.
,
.
又,
.
.······················9分
,.···········11分
.
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