The positions of rational numbers a, B and C on the number axis are shown in the figure below, which is simplified as follows: | a + C | + | C-B | - | b-a| ——a——b———0—c—— | Math enthusiast | Mathematical art

The positions of rational numbers a, B and C on the number axis are shown in the figure below, which is simplified as follows: | a + C | + | C-B | - | b-a| ——a——b———0—c——

|a+c|=-a-c
|c-b|=c-b
|b-a|=b-a
So the original formula is - a-c + c-b-b + a = - 2b

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