设\(f\left(x\right) \)是定义在\(\left[-1,1\right] \)上的奇函数,且对任意的\(a,b∈\left[-1,1\right] \),当\(a+b\neq 0 \)时,都有\(\dfrac{f\left(a\right)+f\left(b\right)}{a+b} > 0\).
\((1)\)若\(a > b\),试比较\(f\left(a\right) \)与\(f\left(b\right) \)的大小;
\((2)\)解不等式\(f\left(x- \dfrac{1}{2}\right) < f\left(x- \dfrac{1}{4}\right) \);
\((3)\)如果\(g\left(x\right)=f\left(x-c\right) \)和\(h\left(x\right)=f\left(x-{c}^{2}\right) \)这两个函数的定义域的交集是空集,求\(c\)的取值范围.