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afla numerele necunoscute: (a×3)-(684:9)=779

Răspuns :

(a*3)-(684:9)=779=>3a-76=779=>3a=779+76=>3a=855=>a=855/3=>a=285
3a- (684:9 ) = 779
3a- 76 = 779
3a = 779 + 76
3a = 855
a = 855 :3
a=285