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a)
1,3,6,12,15,18,21,30
b)
1,9,18,27,36,45,54,63,72,81
c)
12,15,21,30,6
2.
a)nie
b)tak
c)tak
3.
a)
1800,2700,3600,9000,
b)
1200,1500,6000,30000
c)
2000,1000,1400,1100