如何把和式转化为乘积?Change from product to sum

Question

We know that:
\[ a \times b = \underbrace{a + a + a + … + a}_{\text{b times}} \]
That’s how we convert from a product to a sum.

So what happens if we go a little further?
继续阅读 如何把和式转化为乘积?Change from product to sum

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