辽宁省大连市枫叶国际学校七年级上学期数学期中复习试题 第2课时 整式加减.doc

第2课时 整式加减1、 2、3、3 4、5、 6、7、- 8、9、 10、 11、x3(2xy2)(xy2) 12、5a3b6c2a(ac)9a(7bc)13、 14、-15、2（-a3+2a2）-（4a2-3a+1） 16、（4a2-3a+1）-3（-a3+2a2）17、3（a2-4a+3）-5（5a2-a+2） 18、3x2-5x-2（x-）+2x219、7a（a22a ）5（a 2a2 ） 20、3（2a3b）（6a12b）21、 22、； 25、x-2(1-2x+x2)+3(-2+3x-x2) 26、27、-4 28、29、 30、31、 32、33、3（-ab+2a）-（3a-b）+3ab 34、2a2-（ab-a2）+8ab-ab35、 36、4362（42）5 37、2a23a（a3）+a2+5 38、3x27x22（x23x）2x39、 40、41、7xy+xy3+4+6x- xy3-5xy-3 42、-2(4a-3b)+3(5b-3a)43、a2b-5ac-(-3a2c-a2b)+(3ac-4a2c) 44、2(-3x2-xy)-3(-2x2+3xy)-4x2-(2x2-xy+y2)45、-2（3a24）（a23a）（2a2-5a5） 46、5-+（3-2a）-2（5-2a）47、-5xy2-43xy2-（4xy2-2x2y）+2x2y-xy 48、 49、 50、【活动二】（认真独立完成，注意过程规范完整，15分钟）51、解答题：先化简，再求值. （1），其中.（2）.（3）2（a2b3ab2）4（ab23a2b）（a2b2ab2），其中a，b（4）已知Ax2x2，Bx21x，求（1）AB，（2）2A3Bprocess exceeds the allowable interval is guided by the work of joint treatment. For the vibrated concrete to . Design. 5) reasonable time to make serious face concrete construction programme, before construction ready, any abnormal events in time. 6) construction in accordance with design requirements for installation, steel bar installation, deck cleaning and other processes, for pouring concrete and timely maintenance to design time. 7) stiffness and deflection of the template should be controlled. 8) to ensure the quality of concrete construction meet the requirements of construction drawings and specifications, must be of concrete raw materials and mix proportion and construction of the main processes in the implementation of quality control and inspection. 9) on the raw materials and the production process of concrete data, and concrete compressive strength test results for statistical analysis in a timely manner. For sources of statistical methods and standards of quality assessment in accordance with the specification for hydraulic concrete construction (SDJ207-82) shall apply. 10) establish concrete quality control agency, to develop the necessary system in concrete construction during the time of the above test results, and monthly supervision engineer. Once the concrete quality does not meet the requirements, the reasons should be identified, timely submitted to the engineer, and the corresponding measures, consent of the engineer perform. 7.7 construction mechanical equipment configuration main construction mechanical equipment table see Xia table serial number equipment name model specifications units number notes 1 mixing machine 0.5 Taiwan 1 2 concrete mixing station HZS60 Taiwan 3 3 mount machine ZL30 Taiwan 2 4 mount machine ZL50 Taiwan 2 5 concrete mixing car 10m3 Taiwan 6 6 long arm anti-shovel EX220 Taiwan 2 7 concrete pump machine HB-60 Taiwan 2 8 vibrators Taiwan 30 9 vibrators flat Taiwan 6 10 Tower 1 eighth chapter 8.1 of masonry engineering project overview the project primarily for yongxing secondary hydropower station the river hub, pressure forebay, the factory hubs and pressure piping M7.5 masonry civil engineering works of 4207 M3 and factory, the factory of brick masonry construction. 8.2 construction planning based on construction progress, masonry masonry construction should be mainly excavation, concrete construction, without affecting the excavation and concrete construction for the arrangement, masonry construction schedule as detailed in the General Sc