Because b

Because c>0>a, then A-C.

Because1>; C, then1-c >; 0, then |1-c| =1-c;

So m =-a-b-(-b+1)-(c-a)-(1-c) =-a-b+b-1-c =-2.

So 100 meter = -200.

The idea is: 1. Firstly, according to the magnitude relationship of each quantity, it is determined whether the formula in the absolute value sign is greater than zero or less than zero;

2. If it is greater than zero, the time-invariant sign of the absolute value sign will be removed; If it is less than zero, the time-varying sign of the absolute value sign will be removed;

3. Merge similar items and finally simplify them into the simplest form.