(+1.2)+(-0.4)+(+1)+(0)+(-1.1)+(-0.5)+(+0.3)+(0.5)+(-0.6)+(-0.9)=?

问题描述:

(+1.2)+(-0.4)+(+1)+(0)+(-1.1)+(-0.5)+(+0.3)+(0.5)+(-0.6)+(-0.9)=?

-0.5