黑龙江省哈尔滨市第十七中学校2020-2021学年七年级下学期七年级期中学情检测数学试题

17 2021. 4.29 1 2 3 4 5 6 7 8 9 10 A B B B C C B C D C 1 3 5 3 30 11. 10 12. 2 74 −x 13. -2 a 2 14. 100° 15. 4 x 7 16. 45° 17. 20 18. 20° 19. 5 15 20. 16 21. 1 ⎪⎩ ⎪ ⎨ ⎧ = = 5 2 1 y x 2 2 1 x 3 22. 1 2 3 2 23. 3 x 1 x 2 x = -2 3x 4 = -2a a = 1 24. 1 ADC BEC = 180° BEC AEB = 180° ADC = AEB ABC BAD = EBC C BAD = EBC ABC = C 2 ABC C AFE BFD 25. 1 ⎩ ⎨ ⎧ =+ =+ 45023 95065 yx yx ⎩ ⎨ ⎧ = = 75 150 y x A B 100 75 2 130 100 a 100 75 50 a 1460 a 42 a a 43 A 43 26. 1 C = 90° ABC A = 90° ADE = ABC ADE A = ABC A = 90° DE AB 2 G GH DC GHD = 90° AG EAC GEA GHA DGA = AGH D DGA AGH = D 2 DGA = 90° 3 K = 22.5° 27. 1 AC = 4 BC = 10 2 d = t 25 4- 5 16 3 P 7 20 7 24 B $