x∈[-2.5,-2)时,x=-3x∈[-2,-1)时,x=-2x∈[-1,0)时,x=-1x∈[0,1)时,x=0x∈[1,2)时,x=1x∈[2,3)时,x=2x=3时,x=3
讲图很麻烦的,大概就像台阶f(x)=-3 (-2.5 =-2 (-2 =-1 (-1 =0 (0 =1 (1 =2 (2
-2,x∈(-2.5,-2] -1,x∈(-2,-1]f(x)={0,x∈(-1,0] 1,x∈(0,1] 2,x∈(1,2] 3,x∈(2,3]