我们需要计算出这个项目的总成本。

We need to ___work ___out the total cost of the project.

我必须把所有数字计算两遍，以确保我的账目准确无误。

I had to ___work ___out all my figures two times to make sure that my accounts were accurate.

你能计算出这个圆的面积吗？

Can you ___work ___out the area of this circle?