The positions of rational numbers a, B and C are shown in the figure, and the graph of | a + B | - | B-1 | - | a-c | - | 1-C | - B -- a -- 0 -- C -- 1 is calculated

The positions of rational numbers a, B and C are shown in the figure, and the graph of | a + B | - | B-1 | - | a-c | - | 1-C | - B -- a -- 0 -- C -- 1 is calculated

Known: - B < a < - 1 < 0 < C < 1
Ask: | a + B | - | B-1 | - | a-c | - | 1-C|
Original formula = (a + b) - (B-1) - (C-A) - (1-C)
=a+b-b+1-c+a-1+c
=2a