Motto is a short statement giving a rule on how to behave , ____ can inspire us especially when we are ____ (face) with difficulties. Many of us have our mottoes, such as “Where there is a will, there is a way.” Or “Nothing is difficult if you put your heart into it.”, and so on. My motto is “God helps those who help____.” Sometimes I am lazy and don't want to make efforts ____ (work) hard, ____ the moment I think of my motto I will get energetic again and devote myself ____ what I am doing. I write my motto ____ I can see it easily. Every time I fail in my exam and begin to lose heart, the sight of my motto inspires me with much ____ (confident). My motto also makes me become ____ independent person. That is to say, I won't rely on others easily.

    My friends, what is your motto? It is really ____ (benefit) to you. So please choose one as soon as possible.

（Ⅰ）解不等式f（2x）+f（x+4）≥8；

（Ⅱ）若|a|＜1，|b|＜1，a≠0，求证： $\frac{f\left(ab\right)}{\left|a\right|}>f\left(\frac{b}{a}\right)$ ．