a - cyfra jednosci
a-1 - cyfra dziesiatek
2(a-1) - cyfra setek
100*2(a-1)+10(a-1)+a=200a-200+10a-10+a=211a-210
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a - cyfra jednosci
a-1 - cyfra dziesiatek
2(a-1) - cyfra setek
100*2(a-1)+10(a-1)+a=200a-200+10a-10+a=211a-210