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#648170b7-41f8-402f-a641-8583d4c6894d中等fill_compute函数的周期性函数

34. 设f(x)f(x)是定义在RR上周期为4的奇函数,若在区间[2[-20)(00)\bigcup (02]2]上,f(x)={ax+b,2x<0ax1,0<x2f(x)=\left\{{\left.\begin{array}{l}{ax+b,-2\leqslant x<0}\\ {ax-1,0<x\leqslant 2}\end{array}\right.}\right.,则f(2019)=f(2019)=___12\frac{1}{2}___.