
On Teaching Integrals of Multivariable Functions 

ZHAO Yanhui,CHEN Qingjiang,WANG Yan (Department of Mathematics,Xi'an University of Architecture and Technology,Xi'an 710055,PRC) 

Exploration of Surface Helix 

WU Lincong,ZHOU Yan,MO Guoliang(City College,Zhejiang University,Hangzhou 310015,PRC) 

A Lemma for Integral with Parameters 

ZHANG Guoming (Department of Mathematics,Mudanjiang Normal University,Mudanjiang 157011,PRC) 

Two Remarks on Tangent of Quadratic Curves 

LIU Dejin(Department of Mathematics,Dezhou University,Dezhou 253023,PRC) 

Determine Signs of Secondtype Surface Integrals 

WANG Qingdong(School of Mathematics and information,Shangqiu Normal College,Shangqiu 476000,PRC) 

A Criteria for the Location of a Point about Two Intersected Planes 

XU Zhiyuan,WANG Xinchun (School of Science,Hebei Polytechnic University,Tangshan 063009,PRC) 

A Note on the Equation of a Cylinder 

He Guoqing (School of Mathematics and Computer Science,Anhui Normal University,Wuhu 241000,PRC) 

Rotations for Evaluating a Kind of Curvilinear Integrals 

WANG Chun (Department of Mathematics,Changzhi College,Changzhi 046011,PRC) 

Second Type Surface Integral on Vertical Cylinder 

GAN Quan(Department of Mathematics and Physics,Xi'an Technological University,Xi'an 710032,PRC) 

Diagonalization of a Class of Matrices and Applictations 

DAI Li (School of Engineering,Nanjing Agricultural University,Nanjing 210031,PRC) 

Distributions and Expectations of a Class of Twodimensional Random Variables 

Dai Dunjing (Science and Literature Teaching and Research Section,Shijiazhuang Mechanized Infantry Academy,Shijiazhuang 050083,PRC) 

Matrix Method for Simplifying Equation of Quadratic Surface 

LIU Shibo (School of Mathematics Science,Xiamen University,Xiamen 361005,PRC) 

An Implicit Function Approach for Equation of Line 

ZHANG Guoli,LI Jianhua (School of Mathematics and Science,Luoyang Normal University,Luoyang 471022,PRC) 

Double Integral and Integral Inequality Proving 

FENG Weijie,WEI Guangmei (LMIB,School of Mathematics and Systems Science,Beihang University,Beijing 100191,PRC) 

Transfer Multiple Integrals into Product of Integrals 

XIONG Ming1,XIONG Jian2(1.Department of Mathematics,Sichuan Aihua College,Chengdu 610200,PRC;2.Guanmei Middle School,Cangnan 325800,PRC) 

Reverse Thinking for Integrals 

WU Jie (School of Mathematics and Statistics,Huazhong University of Science and Technology,Wuhan 430074,PRC) 

On Modernization and Popularity of Linear Algebra for Engineering 

CHEN Huaichen (School of Electronics Engineering,Xidian University,Xi'an 710071,PRC) 

Series of Stories with Linear Equations 

LI Shangzhi(School of Mathematics and System Sciences,Behang University,Beijing 100191,PRC) 

Some Remarks on Event and Probability 

FU Wende(Department of Mathematics,KaiLi University,KaiLi 556011,PRC) 

Counterexamples in Teaching Higher Mathematics 

FANG Qianshan (Department of Primary Education,Zhangzhou City Vocational College,Zhangzhou 363000,PRC) 

Solutions and Generalizations of a Mathematical Problem 

SHI Jun,ZHANG Li,LIU Zhi(School of Mathematics,Hefei University of Technology,Hefei 230009,PRC) 

MATLAB for Double Integrals 

WANG Ruopeng,XIA Zanxun,XIE Pengyan,ZHANG peng (Department of Mathematics and Physics,Beijing Institute of Petrochemical Technology,Beijing 102617,China) 