Question

6:[12:a-3×(5-10:5)]+2=4

Answer 1

6 : [ 12 : a - 3 x ( 5 - 10 : 5 ) ] + 2 = 4

6 : [ 12 : a - 3 x ( 5 - 2 ) ] = 4 - 2

6 : ( 12 : a - 3 x 3 ) = 2

12 : a - 9 = 6 : 2

12 : a = 3 + 9

12 : a = 12

a = 12 : 12

a = 1 → numarul aflat prin metoda mersului invers

Verificare

6 : [ 12 : 1 - 3 x ( 5 - 10 : 5 ) ] + 2 = 6 : ( 12 - 9 ) + 2 = 6 : 3 + 2 = 2 + 2 = 4