定积分换元法是定积分计算的主要方法之一。
The method of the definite integral by substitution is one of the main techniques among the definite integral calculation.
第二类换元法是一种既重要又不易掌握的积分方法。
The second method of transformation is an important but not-easy-to-master calculus method.
用特定系数法、换元法、配方法探求二元二次函数的极值公式。
The extremal formula of binary quadratic functions is studied by using method of undetermined coefficients, substitution method and method of completing the square.
分析了不定积分的四种基本求解方法：直接积分、第一换元法、第二换元法、分部积分法。
There are four solutions of indefinite integration in paper: direct integration, the first exchangeable integration, the second exchange - able integration, parcel integration.
用有限元法和实验应力分析法对波纹换热管在内压作用下的应力分布规律进行探讨。
Stress distribution rule about corrugated tubes for heat exchanger under the interior pressure was studied by finite element method and experiment investigation.
用有限元法和实验应力分析法对波纹换热管在内压作用下的应力分布规律进行探讨。
Stress distribution rule about corrugated tubes for heat exchanger under the interior pressure was studied by finite element method and experiment investigation.
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