The rules of arithmetic are simple, and all these tools follow them faithfully.
算术规则非常简单，所有这些工具都忠实地遵守它们。
No matter whether you use geometry, trigonometry or calculus, you use the simple rules of arithmetic.
无论你使用几何学，三角形学或者微积分法，你都。
The non-complete worked-example learning effects of different difficult rules of arithmetic operation were different;
用不完整样例学习难度不同的规则，其效果不同；
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