Distribute
 Usage
• Distribute[f[ ,  , ... ]] 将 f 分配到出现在任意  中的 Plus上. • Distribute[expr, g] 分配到g.
• 只用expr 的头为f时，Distribute[expr, g, f] 才进行分配.
Notes
• Distribute有效地实现了算子 f 和 g的分配律. • Distribute明确建立一个分布的完整结果；相反地， Expand只简单地在每一阶段重复建立结果. • 例如: Distribute[f[a+b,c+d]]  . • Distribute[f[a+b,g[x,y],c], g] . • Distribute[expr, g, f, gp, fp]在分配结果中分别使用 gp 和 fp来代替 g 和 f.
 Further Examples
This expresses the classic distributive law of multiplication over addition.
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Here is an equivalent way to write the input.
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This is how taking a power distributes over addition.
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We can generalize this to an arbitrary function.
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Here we distribute over a product instead of a sum (two variations).
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This example is similar to ComplexExpand. (In ComplexExpand the exponent has to be a number.)
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Subsums of a list gives all the possible sums of sublists of the list.
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