@miradreaamy by the way , i disagree it "如果你解开了这个,你的智商就高于平均水平。"
we can see
f(a)+f(b)=f(b+1)*f(a),
f(a+1)=f(a)+1,
f(b+1)=f(b)+1.
so
the last line should be (9+1)*(5+1)=?
the answer should be 6*9=54
Sci-Hub is an evil website that pirated 85M+ research papers and made them freely available
And now they've added AI to their database to make Sci-Bot.
It answers your questions using latest, full-text articles.
But DO NOT use it. We should all try to make billion-dollar academic publishers richer.
I'm putting the link below so you know how to avoid it.