设 a = 2^{0.3}，b = 0.3^2，c = \left(\dfrac…

设 $a = 2^{0.3}$a=20.3，$b = 0.3^2$b=0.32，$c = \left(\dfrac{1}{2}\right)^{0.3}$c=(21​)0.3，则 $a$a、$b$b、$c$c 的大小关系是