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/x/>7
x=7 lub x= -7
liczby dodatnie : 8,9,10
liczby ujemne: -6,-5,-4
2a)
/x/<3
3,2,1,0,-1,-2,-3
-6,7=-67/10
2,28=228/100
1=1/1
0=0/1
-2,5=-25/10
2 i 1/2=5/2
a) x∈{-2;-1;0;1;2}
b) np. x∈{-19;-18;-17;100;245;453}