Question

54-45:[30-24:(x-15)-7]×15=9
Va rog

Answer 1

Răspuns

Explicație pas cu pas:

54 - 45 : [ 30 - 24 : ( x - 15 ) - 7 ] × 15 = 9

45 : [ 30 - 24 : ( x - 15 ) - 7 ] × 15 = 54 - 9

45 : [ 30 - 24 : ( x - 15 ) - 7 ] × 15 = 45

45 : [ 30 - 24 : ( x - 15 ) - 7 ] = 45 : 15

45 : [ 30 - 24 : ( x - 15 ) - 7 ] = 3

30 - 24 : ( x - 15 ) - 7 = 45 : 3

30 - 24 : ( x - 15 ) - 7 = 15

30 - 24 : ( x - 15 ) = 15 + 7 = 22

24 : ( x - 15 ) = 30 - 22

24 : ( x - 15 ) = 8

x - 15 = 24 : 8

x - 15 = 3

x = 3 + 15

x = 18 → numarul, aflat prin metoda mersului invers