12．已知函数f(x)={2x,x⩽1log2x,x>1f(x)=\left\{{\left.\begin{array}{l}{{2^x},}&{x\leqslant 1}\\ {lo{g_2}x,}&{x>1}\end{array}\right.}\right.f(x)={2x,log2x,x⩽1x>1，若函数y=f(x)+2x+ay=f(x)+2x+ay=f(x)+2x+a有两个零点，则实数aaa的取值范围是 ___[−4[-4[−4[，]−2)-2)−2)___．