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Efectuează ân doua moduri
(30+9):3=?


Răspuns :

=  39 :3 = 13 
= 30:3 + 9 :3 = 10 +3 =13
(30+9):3=39:3=13


[tex](30+9):3= \frac{30+9}{3} = \frac{30}{3} + \frac{9}{3} =10+3=13[/tex]