%A Lei Wang(王磊), Xiang-Guo Meng(孟祥国), Ji-Suo Wang(王继锁) %T Recast combination functions of coordinate and momentum operators into their ordered product forms %0 Journal Article %D 2020 %J Chin. Phys. B %R 10.1088/1674-1056/ab7dbd %P 50303-050303 %V 29 %N 5 %U {https://cpb.iphy.ac.cn/CN/abstract/article_122403.shtml} %8 2020-05-05 %X By using the parameter differential method of operators, we recast the combination function of coordinate and momentum operators into its normal and anti-normal orderings, which is more ecumenical, simpler, and neater than the existing ways. These products are very useful in obtaining some new differential relations and useful mathematical integral formulas. Further, we derive the normally ordered form of the operator (fQ+gP)-n with n being an arbitrary positive integer by using the parameter tracing method of operators together with the intermediate coordinate-momentum representation. In addition, general mutual transformation rules of the normal and anti-normal orderings, which have good universality, are derived and hence the anti-normal ordering of (fQ+gP)-n is also obtained. Finally, the application of some new identities is given.