8.
对定义在\(\left[0,1\right] \)上,并且同时满足以下两个条件的函数\(f\left(x\right) \)称为\(G\)函数.
\(①\)对任意的\(x∈\left[0,1\right] \),总有\(f\left(x\right)\geqslant 0 \);
\(②\)当\({x}_{1}\geqslant 0,{x}_{2}\geqslant 0,{x}_{1}+{x}_{2}\leqslant 1 \)时,总有\(f\left({x}_{1}+{x}_{2}\right)\geqslant f\left({x}_{1}\right)+f\left({x}_{2}\right) \)成立.
已知函数\(h\left(x\right)={2}^{x}-b \)是定义在\(\left[0,1\right] \)上的函数,若函数\(h\left(x\right) \)是\(G\)函数,求实数\(b\)组成的集合是 .