The positions of rational numbers a, B and C on the number axis are shown in the figure, simplifying La + bl-la-b-cl-lb-al + LB + CL -——c------b----------------0------a------->

la+bl-la-b-cl-lb-al+lb+cl
=-(a+b)-(a-b-c)+(b-a)-(b+c)
=-a-b-a+b+c+b-a-b-c
=-3a

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2. The positions of rational numbers a, B and C on the number axis are shown in the figure= -------c--------a------0---------b--------
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