Răspuns :
Răspuns: 20
Explicație pas cu pas:
Notez numarul cu ,,a"
[ ( a : 2 + 4 ) × 6 - 4 ] : 8 = 10
( a : 2 + 4 ) × 6 - 4 = 10 × 8
( a : 2 + 4 ) × 6 - 4 = 80
( a : 2 + 4 ) × 6 = 80 + 4
( a : 2 + 4 ) × 6 = 84
a : 2 + 4 = 84 : 6
a : 2 + 4 = 14
a : 2 = 14 - 4
a : 2 = 10
a = 10 × 2
a = 20 → numarul, aflat prin metoda mersului invers
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Verific:
[ ( 20 : 2 + 4 ) × 6 - 4 ] : 8 = 10
= ( 14 × 6 - 4 ) : 8 =
= 80 : 8 =
= 10
N = numărul
[ ( N : 2 + 4 ) × 6 - 4 ] : 8 = 10
[ ( N : 2 + 4 ) × 6 - 4 ] = 10 × 8
[ ( N : 2 + 4 ) × 6 - 4 ] = 80
[ ( N : 2 + 4 ) × 6 ] = 80 + 4
[ ( N : 2 + 4 ) × 6 ] = 84
N : 2 + 4 = 84 : 6
N : 2 + 4 = 14
N : 2 = 14 - 4
N : 2 = 10
N = 10 × 2
N = 20