Question

c小于a小于0小于b 化简[a+b]+[b-c]-[a+c][ ]代表绝对值 绝对值不会打用这个代替

Answer 1

|a+b|+|b-c|-|a+c|

=|a+b|+b+|c|-(|a|+|c|)

=|a+b|+b+|a|

=2|a+b|