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1、黔西南2012年中考数学及答案(中考真题)绝密?启用前 贵州省黔西南州2012年年初中毕业生学业暨升学统一考试试题 数学 注意事项:1、一律用黑色笔或2B铅笔将答案直接填写在试卷上。 2 、本卷共八个大题，26个小题，满分150分，答题时间120分钟。 一、选择题(每小题4分，共40分) 11、的倒数是【 】 ,145544(A) (B) (C) (D) ,4455【答案】C。 2、下列运算正确的是【 】 34124374312437 (A),aa=a (B)aa=a, (C)a=a (D)aa=a+ ，【答案】C。 3a,3、在实数范围内有意义，则a的取值范围【 】 (A)a?3 (B)a?
2、3 (C)a?,3 (D)a?,3 【答案】B。 2x10x+21=0,4、三角形的两边长分别为2和6，第三边是方程-的解，则第三边的长为【 】 (A)7 (B)3 (C)7或3 (D)无法确定 【答案】A。 5、袋子了有3个红球和2个蓝球，它们只有颜色上的区别，从袋子中随机地取出一个球，取出红球的概率是【 】 2323(A) (B) (C) (D) 5532【答案】B。 6、如图，?O是?ABC的外接圆，已知?ABO,40?，则?ACB的大小为【 】 (A)40? (B)30? (C)50? (D)60? 【答案】C。 7、兴义市进行城区规划，工程师需测某楼AB的高度，工程师在D得用高2m的
3、测角仪CD，测得楼顶端main construction machines configured list of main construction equipment number equipment name model units number remark, lifting and transportation equipment 1 car SCC6000 3 2 1 rental car SCC2600 1 rental car QY50C 2 4 car QY25C 4-owned 5-owned truck crane QY12C 3 6 TC6024 tower crane-
4、owned 2-7 TC5513 3 tower cranes-lease 8 upgrade SMZ20 3 owned 9 flatbed trailer 10 truck 25t 50T 2 rental 5-owned 11 tools 1.5T set SY5250GJB3A 2-owned 12 concrete pump truck set 5 lease 13 SY5310THB40R 14 2 rental of concrete pump truck forklift truck 5T 1-owned 25t 2 owned 16 15 electric winch hoi
5、sts 10T 3 owned 17 manual hoists 10T 40 owned 18 manual hoists 5T 10 owned 19 manual Hu Lu 2T 3T 10 owned 20 manual hyacinth 10 owned 21 hydraulic jack 20T 15 owned 22 hydraulic jack 10T 10-owned three-, welding and lathe equipment and pipeline installation machinery 1 C620 3 2 radial drilling machi
6、ne-owned Z50 4 3-owned semi-automatic cutting machine GZ-100A 15-owned 4 wheel cutter 400 20 5 plasma cutting machine 25-owned owned 150 100-owned 6 angle grinder 7 angle grinder diameter 100 180 owned 8 internal grinding machine 75 owned 9 electric test pump SY600 4-owned 2U-6/8 10 portable air com
7、pressor 2-owned 1/2 4 11 tube Bender 5-owned 12 electric pipe threader 5 out of . A comprehensive system of education for construction through technology to give the low-down, deeper knowledge of engineering construction personnel, enhance the quality of construction, security, and civil constructio
8、n. (2) machine check: needed for construction machinery inventory verification, see construction equipment, machinery is intact, a variety of motor are working properly, is safe and reliable. Detection tools are complete and in good condition, discovered the problem in time to replace or repair. (3)
9、 all pipes, pipe fittings, valves, welding material must have the materials quality certificate, its content and form must A的仰角为30?，然后向楼前进30m到达E，又测得楼顶端A的仰角为60?，楼AB的高为【 】 103+2m203+2m53+2m153+2m(A) (B) (C) (D) ，【答案】D。 2,23 8、如图，?O的半径为2，点A的坐标为，直线AB为?O的切线，B为切点，则B点的坐标，为【 】 ,4938, ,3,1 ,1,3 (A) (B) (C) (
10、D) , ，,5525,【答案】D。 29、已知一次函数和反比例函数的图象在平面直角坐标系中交于A、B两点，当y,y时，y=x1,y=1212xx的取值范围是【 】 ,1x0,1x0(A) (B) (C)， (D)， x2x2x2，,?可以采用的方案有6种方案:生产A产品2件，B产品8件; A产品3件， B产 品7件;A产品4件， B产品6件;A产品5件，B产品5件;A产品6件，B产品4件;A产品7件，B产品3件。 (3)设生产A种产品x件时，利润为z万元，根据题意，得 z=x?1，(10,x)?3=,2x，30， ?,2,0，?随着x的增大，z减小。 ?当x=2时，z最大，最大利润z=,22
11、，30=26。 所以当生产A产品2件、B产品8件时 ，可获得最大利润16万元。 七、(本大题14分)请阅读下列材料: main construction machines configured list of main construction equipment number equipment name model units number remark, lifting and transportation equipment 1 car SCC6000 3 2 1 rental car SCC2600 1 rental car QY50C 2 4 car QY25C 4-owned 5
12、-owned truck crane QY12C 3 6 TC6024 tower crane-owned 2-7 TC5513 3 tower cranes-lease 8 upgrade SMZ20 3 owned 9 flatbed trailer 10 truck 25t 50T 2 rental 5-owned 11 tools 1.5T set SY5250GJB3A 2-owned 12 concrete pump truck set 5 lease 13 SY5310THB40R 14 2 rental of concrete pump truck forklift truck
13、 5T 1-owned 25t 2 owned 16 15 electric winch hoists 10T 3 owned 17 manual hoists 10T 40 owned 18 manual hoists 5T 10 owned 19 manual Hu Lu 2T 3T 10 owned 20 manual hyacinth 10 owned 21 hydraulic jack 20T 15 owned 22 hydraulic jack 10T 10-owned three-, welding and lathe equipment and pipeline install
14、ation machinery 1 C620 3 2 radial drilling machine-owned Z50 4 3-owned semi-automatic cutting machine GZ-100A 15-owned 4 wheel cutter 400 20 5 plasma cutting machine 25-owned owned 150 100-owned 6 angle grinder 7 angle grinder diameter 100 180 owned 8 internal grinding machine 75 owned 9 electric te
15、st pump SY600 4-owned 2U-6/8 10 portable air compressor 2-owned 1/2 4 11 tube Bender 5-owned 12 electric pipe threader 5 out of . A comprehensive system of education for construction through technology to give the low-down, deeper knowledge of engineering construction personnel, enhance the quality
16、of construction, security, and civil construction. (2) machine check: needed for construction machinery inventory verification, see construction equipment, machinery is intact, a variety of motor are working properly, is safe and reliable. Detection tools are complete and in good condition, discovered the problem in time to replace or repair. (3) all pipes, pipe fittings, valves, welding material must have the materials quality certificate, its content and form must 225、问题:已知方程，求一个一元二次方程，使它的根分别是已知方程根的2倍。 x