Pentru 10
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9+(9:9)=10
9+1=10
10=10
Pentru 100
-------------
[9+(9:9)]*[9+(9:9)]=100
(9+1)*(9+1)=100
10*10=100
100=100
Pentru 1000
----------------
[9+(9:9)]*[9+(9:9)]*[9+(9:9)]=1000
(9+1)*(9+1)*(9+1)=1000
10*10*10=1000
100*10=1000
1000=1000
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Sper ca te am ajutat!!!!!