Răspuns: n = 1
Explicație pas cu pas:
8 - 7 : [ 6 - 5 × ( 32 : 8 - 4 : n ) + 1 ] - 6 = 1
8 - 7 : [ 6 - 5 × ( 4 - 4 : n ) + 1 ] = 1 + 6
8 - 7 : [ 6 - 5 × ( 4 - 4 : n ) + 1 ] = 7
7 : [ 6 - 5 × ( 4 - 4 : n ) + 1 ] = 8 - 7
7 : [ 6 - 5 × ( 4 - 4 : n ) + 1 ] = 1
6 - 5 × ( 4 - 4 : n ) + 1 = 7 : 1
6 - 5 × ( 4 - 4 : n ) + 1 = 7
6 - 5 × ( 4 - 4 : n ) = 7 - 1
6 - 5 × ( 4 - 4 : n ) = 6
5 × ( 4 - 4 : n ) = 6 - 6
5 × ( 4 - 4 : n ) = 0
4 - 4 : n = 0 : 5
4 - 4 : n = 0
4 : n = 4 - 0
4 : n = 4
n = 4 : 4
n = 1 → numărul, aflat prin metoda mersului invers
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Verific:
8 - 7 : [ 6 - 5 × ( 32 : 8 - 4 : 1 ) + 1 ] - 6 = 1
= 8 - 7 : ( 6 - 5 × 0 + 1 ) - 6 =
= 8 - 7 : 7 - 6 =
= 8 - 1 - 6 =
= 7 - 6
= 1