正方体与长方体表面积公式

正方体与长方体 表 关于同志近三年现实表现材料材料类招标技术评分表图表与交易pdf视力表打印pdf用图表说话 pdf 面积公式 正方体表面积公式:S=6×(棱长×棱长) 字母:S=6a? 长方体表面积公式:S=(长×宽，长×高，宽×高)×2 或:S=长×宽×2，长×高×2，宽×高×2 字母:S=2(ab，ah，bh) 或:S=2ab，2ah，2bh 正方体 V:体积 a:棱长 体积=棱长×棱长×棱长 V=a×a×a 长方体 V:体积 a:长 b: 宽 h:高 体积=长×宽×高 V=abh 圆柱体体积 底面积*高 V=3.14*R^2*H 圆柱体面积公式 下面一个圆的周长*高 S=3.14*2R*H 圆的周长公式,,,π r圆的面积公式,,π r? (π=3.14; r为圆的半径;) 7、甲、乙两人生产一批零件,甲、乙工作效率的比是2:1，两人共同生产了3天后，剩下的由乙单独生产2天就全部完成了生产任务，这时甲比乙多生产了14个零件，这批零件共有多少个, 解:将乙的工作效率看作单位1 那么甲的工作效率为2 乙2天完成1×2=2 乙一共生产1×(3+2)=5 甲一共生产2×3=6 所以乙的工作效率=14/(6-5)=14个/天 甲的工作效率=14×2=28个/天 一共有零件28×3+14×5=154个 或者设甲乙的工作效率分别为2a个/天，a个/天 2a×3-(3+2)a=14 6a-5a=14 a=14 meet the standard requirements. Post weld heat treatment of pipes after heat treatment, hardness tests should be conducted, hardness test sampling of not less than 10%, hardness 120%,15CrMo hardness of carbon steel pipe shall be less than base metal steel after heat treatment, hardness should not be greater than the parent material of 125%. Rate of pipeline nondestructive testing shall be carried out according to the design requirements, no no design requirements the SH3501-2002 table 10 "percentage of radiographic examination of welded joints and acceptable level", and fixed number not less than the total number of 40% weld inspection. This project has a wall thickness of 32mm 20# steel high pressure tube, x-rays cannot penetrate, the situation may not allow non-destructive testing by γ-ray, used weld backing and two-layer welds before filled by x ray detection method, the other layer by ultrasonic detector method. Should be consistent with existing national standards for radiographic testing of the ... Gas tank used chain for this project promoted the upsidedown construction. Chain reversal installation method shown in the following figure: welders Welders and welding methods to participate in this project should be in accordance with the Ministry of personnel issued by the boilers and pressure vessels welder examination rules for qualification examination, after passing the qualification certificate of welding work. Tank welding manual arc welding, automatic welding. Manual arc welding company has a number of excellent welder, took part in all kinds of large, medium and small storage tank, pressure vessel welding, with rich experience, manual welding characteristics are not subject to location restrictions, welding deformation easy to control. This engineering welding construction of shielded metal arc welding methods. 一共有零件28×3+14×5=154个 8、一个工程项目，乙单独完成工程的时间是甲队的2倍;甲乙两队合作完成工程需要20天;甲队每天工作费用为1000元，乙每天为550元，从以上信息，从节约资金角度，公司应选择哪个,应付工程队费用多少, 解:甲乙的工作效率和=1/20 甲乙的工作时间比=1:2 那么甲乙的工作效率比=2:1 所以甲的工作效率=1/20×2/3=1/30 乙的工作效率=1/20×1/3=1/60 甲单独完成需要1/(1/30)=30天 乙单独完成需要1/(1/60)=60天 甲单独完成需要1000×30=30000元 乙单独完成需要550×60=33000元 甲乙合作完成需要(1000+550)×20=31000元 很明显 甲单独完成需要的钱数最少 选择甲，需要付30000元工程费。 9、一批零件，甲乙两人合做5.5天可以超额完成这批零件的0.1，现在先由甲做2天，后由后由甲乙合作两天，最后再由乙接着做4天完成任务，这批零件如果由乙单独做几天可以完成, 解:将全部零件看作单位1 那么甲乙的工作效率和=(1+0.1)/5.5=1/5 整个过程是甲工作2+2=4天 乙工作2+4=6天 相当于甲乙合作4天，完成1/5×4=4/5 那么乙单独做6-4=2天完成1-4/5=1/5 所以乙单独完成需要2/(1/5)=10天 10、有一项工程要在规定日期内完成，如果甲工程队单独做正好如期完成，如果乙工程队单独做就要超过5天才能完成。现由甲、乙两队合作3天，余下的工程由乙队单独做正好按期完成，问规定日期是多少天, 解:甲做3天相当于乙做5天 甲乙的工作效率之比=5:3 那么甲乙完成时间之比=3:5 所以甲完成用的时间是乙的3/5 所以乙单独完成需要5/(1-3/5)=5/(2/5)=12.5天 规定时间=12.5-5=7.5天 四、巩固练习( meet the standard requirements. Post weld heat treatment of pipes after heat treatment, hardness tests should be conducted, hardness test sampling of not less than 10%, hardness 120%,15CrMo hardness of carbon steel pipe shall be less than base metal steel after heat treatment, hardness should not be greater than the parent material of 125%. Rate of pipeline nondestructive testing shall be carried out according to the design requirements, no no design requirements the SH3501-2002 table 10 "percentage of radiographic examination of welded joints and acceptable level", and fixed number not less than the total number of 40% weld inspection. This project has a wall thickness of 32mm 20# steel high pressure tube, x-rays cannot penetrate, the situation may not allow non-destructive testing by γ-ray, used weld backing and two-layer welds before filled by x ray detection method, the other layer by ultrasonic detector method. Should be consistent with existing national standards for radiographic testing of the ... Gas tank used chain for this project promoted the upsidedown construction. Chain reversal installation method shown in the following figure: welders Welders and welding methods to participate in this project should be in accordance with the Ministry of personnel issued by the boilers and pressure vessels welder examination rules for qualification examination, after passing the qualification certificate of welding work. Tank welding manual arc welding, automatic welding. Manual arc welding company has a number of excellent welder, took part in all kinds of large, medium and small storage tank, pressure vessel welding, with rich experience, manual welding characteristics are not subject to location restrictions, welding deformation easy to control. This engineering welding construction of shielded metal arc welding methods. 1(一个长方体长4米，宽3米，高2.5米(它的表面积是多少平方米,(用两种方法计算) 2(一个长方体铁盒，长18厘米，宽15厘米，高12厘米(做这个铁盒至少要用多少平方厘米的铁皮, 五、课堂小结( 通过解答例1和做一做，你发现长方体表面积的计算方法吗, 结论:长方体的表面积,长×宽×2，长×高×2，宽×高×2 ,(长×宽，长×高，宽×高)×2 六、课后作业( 1(一个长方体的木箱，长1.2米，宽0.8米，高0.6米，做这个木箱至少要用多少平方米木板,如果这个木箱不做上盖呢, 2(一个长方体的形状大小如下图( (1)它上、下两个面的面积分别是多少平方分米, meet the standard requirements. Post weld heat treatment of pipes after heat treatment, hardness tests should be conducted, hardness test sampling of not less than 10%, hardness 120%,15CrMo hardness of carbon steel pipe shall be less than base metal steel after heat treatment, hardness should not be greater than the parent material of 125%. Rate of pipeline nondestructive testing shall be carried out according to the design requirements, no no design requirements the SH3501-2002 table 10 "percentage of radiographic examination of welded joints and acceptable level", and fixed number not less than the total number of 40% weld inspection. This project has a wall thickness of 32mm 20# steel high pressure tube, x-rays cannot penetrate, the situation may not allow non-destructive testing by γ-ray, used weld backing and two-layer welds before filled by x ray detection method, the other layer by ultrasonic detector method. Should be consistent with existing national standards for radiographic testing of the ... Gas tank used chain for this project promoted the upsidedown construction. Chain reversal installation method shown in the following figure: welders Welders and welding methods to participate in this project should be in accordance with the Ministry of personnel issued by the boilers and pressure vessels welder examination rules for qualification examination, after passing the qualification certificate of welding work. Tank welding manual arc welding, automatic welding. Manual arc welding company has a number of excellent welder, took part in all kinds of large, medium and small storage tank, pressure vessel welding, with rich experience, manual welding characteristics are not subject to location restrictions, welding deformation easy to control. This engineering welding construction of shielded metal arc welding methods. (2)它前、后两个面的面积分别是多少平方分米, (3)它左、右两个面的面积分别是多少平方分米, 七、板书设计 长方体和正方体的表面积 长方体或者正方体6个面的总面积，叫做它的表面积( 例1、做一个长6厘米，宽5厘米，高4厘米的长方体的纸盒，至少要用多少平方厘米的硬纸板, (6×5，6×4，5×4)×2 ,(30，24，20)×2 , 74×2 , 148(平方厘米) meet the standard requirements. Post weld heat treatment of pipes after heat treatment, hardness tests should be conducted, hardness test sampling of not less than 10%, hardness 120%,15CrMo hardness of carbon steel pipe shall be less than base metal steel after heat treatment, hardness should not be greater than the parent material of 125%. Rate of pipeline nondestructive testing shall be carried out according to the design requirements, no no design requirements the SH3501-2002 table 10 "percentage of radiographic examination of welded joints and acceptable level", and fixed number not less than the total number of 40% weld inspection. This project has a wall thickness of 32mm 20# steel high pressure tube, x-rays cannot penetrate, the situation may not allow non-destructive testing by γ-ray, used weld backing and two-layer welds before filled by x ray detection method, the other layer by ultrasonic detector method. Should be consistent with existing national standards for radiographic testing of the ... Gas tank used chain for this project promoted the upsidedown construction. Chain reversal installation method shown in the following figure: welders Welders and welding methods to participate in this project should be in accordance with the Ministry of personnel issued by the boilers and pressure vessels welder examination rules for qualification examination, after passing the qualification certificate of welding work. Tank welding manual arc welding, automatic welding. Manual arc welding company has a number of excellent welder, took part in all kinds of large, medium and small storage tank, pressure vessel welding, with rich experience, manual welding characteristics are not subject to location restrictions, welding deformation easy to control. This engineering welding construction of shielded metal arc welding methods. meet the standard requirements. Post weld heat treatment of pipes after heat treatment, hardness tests should be conducted, hardness test sampling of not less than 10%, hardness 120%,15CrMo hardness of carbon steel pipe shall be less than base metal steel after heat treatment, hardness should not be greater than the parent material of 125%. Rate of pipeline nondestructive testing shall be carried out according to the design requirements, no no design requirements the SH3501-2002 table 10 "percentage of radiographic examination of welded joints and acceptable level", and fixed number not less than the total number of 40% weld inspection. This project has a wall thickness of 32mm 20# steel high pressure tube, x-rays cannot penetrate, the situation may not allow non-destructive testing by γ-ray, used weld backing and two-layer welds before filled by x ray detection method, the other layer by ultrasonic detector method. Should be consistent with existing national standards for radiographic testing of the ... Gas tank used chain for this project promoted the upsidedown construction. Chain reversal installation method shown in the following figure: welders Welders and welding methods to participate in this project should be in accordance with the Ministry of personnel issued by the boilers and pressure vessels welder examination rules for qualification examination, after passing the qualification certificate of welding work. Tank welding manual arc welding, automatic welding. Manual arc welding company has a number of excellent welder, took part in all kinds of large, medium and small storage tank, pressure vessel welding, with rich experience, manual welding characteristics are not subject to location restrictions, welding deformation easy to control. This engineering welding construction of shielded metal arc welding methods.