Question

1+{2*[3+(4+a):5]-6}*7=15​

Answer 1

Răspuns:

a = 1

Explicație pas cu pas:

1+{2·[3+(4+a):5]-6} ·7=15​  <=>

{2·[3+(4+a):5]-6} ·7 = 15-1 = 14  <=>

2·[3+(4+a):5] - 6 = 14:7 = 2  <=>

2·[3+(4+a):5] = 2+6 = 8 <=>

3+(4+a):5 = 8:2 = 4 <=>

(4+a):5 = 4-3 = 1 <=>

4+a = 1·5 = 5 <=>

a = 5-4 = 1

a = 1

Answer 2

1 + { 2 × [ 3 + ( 4 + a ) : 5 ] - 6 } × 7 = 15

{ 2 × [ 3 + ( 4 + a ) : 5 ] - 6 } × 7 = 15 - 1

{ 2 × [ 3 + ( 4 + a ) : 5 ] - 6 } × 7 = 14

2 × [ 3 + ( 4 + a ) : 5 ] - 6 } = 14 : 7

2 × [ 3 + ( 4 + a ) : 5 ] - 6 = 2

2 × [ 3 + ( 4 + a ) : 5 ] = 2 + 6

2 × [ 3 + ( 4 + a ) : 5 ] = 8

3 + ( 4 + a ) : 5 = 8 : 2

3 + ( 4 + a ) : 5 = 4

( 4 + a ) : 5 = 4 - 3

( 4 + a ) : 5 = 1

4 + a = 1 × 5

4 + a = 5

a = 5 - 4

a = 1