Question

2•{99:[4+(3-a). 2+1]}=18​

Answer 1

Răspuns:  a = 0

Explicație pas cu pas:

2 × { 99 : [ 4 + ( 3 - a ) × 2 + 1 ] } = 18

99 : [ 4 + ( 3 - a ) × 2 + 1 ] = 18 : 2

99 : [ 4 + ( 3 - a ) × 2 + 1 ] = 9

4 + ( 3 - a ) × 2 + 1 = 99 : 9

4 + ( 3 - a ) × 2 + 1 = 11

( 3 - a ) × 2 = 11 - 1 - 4

( 3 - a ) × 2 = 10 - 4

( 3 - a ) × 2 = 6

3 - a = 6 : 2

3 - a = 3

a = 3 - 3

a = 0 → numarul, aflat prin metoda mersului invers