被减数
减数
差
80
60
____
65
4
78
70
定义在R上的函数f(x)满足f(x+6)=f(x),当-3≤x≤-1时,f(x)=-(x+2)2当-1≤x≤3时,f(x)=x,则f(1)+f(2)+f(3+⋯+f(2012)=( )
—I think you are right. We should talk with our parents or they may feel sad.