m=5π/6
f(x-m)=-1/2sinx关于原点对称有没有过程啊关于原点对称就是奇函数。f(x-m)=-f(-x-m)=>1/2sin(x-π/6-m)=-1/2sin(-x-π/6-m)=1/2sin(x+π/6+m)=>x+π/6+m-(x-π/6-m)=2π=>m=5π/6