q1 So let me just rewrite that as, I just want to divide by q1 everywhere.

分子分母同时除以，现在我写的这些。

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We can just rewrite that, if I divide through by 2 and rearrange, it's going to tell me that ?1, or if you like, ?1 is equal to 1 plus B S2.

我们这么写,如果我除以2然后整理,可以得出?1等于1+B*S2

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