|2*1/4 -3| + |2*1/4+1| = |1/2-3| + |1/2+1| = 3-1/2 +1/2+1 = 4
[tex]\it a=\dfrac{1}{4}=0,25\\ \\ |2\cdot0,25-3|+|2\cdot0,25+1|=|-2,5|+|1,5|=2,5+1,5=4[/tex]
