求幂和公式的三种方法 Studies in College Mathematics
我们用从负无穷到正无穷的积分公式F(x)*x*dx,你看到的，这是相同的事，因为积分是类似的求和过程。
We have the integral from minus infinity to plus infinity of F(x)*x*dx, and that's really--you see it's the same thing because an integral is analogous to a summation.
而这几个公式的求和问题不论是用初等方法或分析方法都是比较困难的，但用概率的方法却比较容易解决。
These sum problems are all difficult for using elementary method and analysis method, but we can easily solve these sum problems by using the probability method.
股份的决定将首次基于一个专门制定以反映世界银行集团的需求和任务的公式：持股情况不但要反映经济实力，而且也要依据对我们为世界上最贫穷国家设立的基金提供捐赠的情况。
For the first time, shareholdings would be based on a formula specifically developed to reflect the needs and mandates of the World Bank group.
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