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In 2008, junior college students didn't understand the answer to the 46 th question in the math exam, and they didn't know how to solve it.
The purpose of this is to put (x? +5)/2, add up to contain 5/(x? The formula of the reciprocal of -3 can be used in that limit formula.

(x? +5)/2=(x? -3+8)×5/5/2=(x? -3+8)/5×(5/2)=(x? -3)/5+8/5×(5/2)=(x? -3)/5+4

In short, the purpose is to make "the part after 1+ in brackets" and "the index outside brackets" into reciprocal forms.

I sent you pictures and words. I don't know if you can understand them.