The influence of central executive of working memory on arithmetic cognitive strategies of 113 children in primary 2 by using dual-task paradigm was explored.

运用“双重任务”范式，以113名小学二年级儿童为被试，考察了儿童工作记忆的中央执行对算术认知策略表现的影响。

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Based on the primary quadric error metric arithmetic, combined with boundary constrained condition and normal restriction, the primary arithmetic is modified and the application scope is extended.

在二次误差度量算法的基础上，考虑边界约束条件和法向量限制，扩展了算法的应用范围。

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The arithmetic that of seller′s trading conditions be converted primary factors and secondary factors is put forward, the bargainor could be filtered gradually according as optimal integrated factors.

依据交易模型得到买方最优主要综合因素和次最优综合因素，根据最优综合因素逐步筛选出最可达成交易的卖方。

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At primary school, it says there should be more emphasis on arithmetic and that some topics, such as the calculation of fractions, volume and area should be covered earlier.

BBC: Maths skills add up to higher earnings, study finds