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1.Alfa nr. necunoscut: (plz)
(40-c:3) x 2= 68


Răspuns :

40-c:3=68:2
40-c:3=34
c:3=34+40
c:3=74
c=74x3
c=222
(40-c:3)x2=68
(40-c:3)=68:2
(40-c:3)=34
c:3=40-34
c:3=6
c=6x3
c=18