The corresponding points of real numbers a, B and C on the number axis are shown in the figure —————_ 4——_ 3—— _ 2—— _ 1 ——O——1——2——3——4——5——— A is between minus 4 and minus 3, B is between minus 1 and minus 2, and C is between two and three Simplification: | A-B | - | C-A | + | B-C|

The corresponding points of real numbers a, B and C on the number axis are shown in the figure —————_ 4——_ 3—— _ 2—— _ 1 ——O——1——2——3——4——5——— A is between minus 4 and minus 3, B is between minus 1 and minus 2, and C is between two and three Simplification: | A-B | - | C-A | + | B-C|

A is between minus 4 and minus 3, B is between minus 1 and minus 2, and C is between two and three
Then c > b > a
|a-b|-|c-a|+|b-c|
=b-a-(c-a)+c-b
=0