Wartość bezwzględna

/ a, gdy a>=0

|a|= |

\-a, gdy a<0

|12|=12, |0|=0, |-3|=3

|-2/3+1/6|=|-4/6+1/6|=|-3/6|= =3/6=1/2

|-2/3|+|1/6|=4/6+1/6=5/6

|-0,2-(-1,4)|=|-0,2+1,4|=1,2

|-0,2|-|-1,4|=0,2-1,4=-1,2

|x|=6 x=6 i x=-6

|x+2|=3

dla x>=0 dla x<0

x+2=3 i -x-2=3

x=3-2=1 i -x=3+2=5

|x|<3

dla x>=0 dla x<0

x<3 i -x<3

x>-3

(-3;3)={x∈R:-3<x<3}

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-3 -2 -1 0 1 2 3 4 5