We'll have two IT classes this afternoon. What about____(they)?
设函数F(x)= {f(x),f(x)≥g(x)g(x),f(x)<g(x) ,其中f(x)=log2(x2+1),g(x)=log2(|x|+7).
不等式 3x+12-5≤3 的正整数解的和为____.