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efectuati
dau coroana clasa 3

999+999=(999*9)+1


Răspuns :

999 + 999 : ( 999 : 9 ) +1= 1 009
= 999 + 999 : 111 + 1= 
= 999 + 9 + 1 =
= 1 009

999+999:( 999:9 )+1=

= 999+999/111+1= 

= 999+9+1=1009