Răspuns:
X = 70
Explicație pas cu pas:
63 - { 4 + 5 x [8 x( 10-X : 10)]} : 2 = 1
{4 + 5 x [ 8 x ( 10 - X : 10 )]} : 2 = 63 - 1
{4 + 5 x [ 8 x ( 10 - X : 10 )]} : 2 = 62
4 + 5 x [8 x ( 10 - X : 10)] = 62 x 2
4 + 5 x [ 8 x ( 10 - X : 10)] = 124
5 x [8 x ( 10 - X : 10)]= 124 - 4
5 x [8 x ( 10 - X : 10) = 120
8 x ( 10 - X : 10 ) = 120 : 5
8 x ( 10 - X : 10 ) = 24
10 - X : 10 = 24 : 8
10 - X : 10 = 3
X : 10 = 10 - 3
X : 10 = 7
X = 7 x 10
X = ‘70
