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Restaurant, travel, rentals…
Organize group expenses with the agility of a spreadsheet.
The Rule of Three is a method for solving proportion equations with one unknown value. It is commonly used in pricing, recipes, scaling measurements, and percentage-style comparisons.
直接比例意味着数值一起增长或缩小。反比例意味着一个值增长而另一个值减少。此工具支持这两种模式。

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