Răspuns :
a+b=150
a-b=38
a=38+b
38+2b=150
2b=150-38
2b=150-38
2b=112
b=112:2
b=56
a=b+38
a=56+38
a=94
a-b=38
a=38+b
38+2b=150
2b=150-38
2b=150-38
2b=112
b=112:2
b=56
a=b+38
a=56+38
a=94
a = |________|.+38.|
b = |________|
=> 2 * |________| + 38 = 150
2 * |________| = 150-38=112
|________| = 112 : 2 = 56 = b
a = 56+38 = 94
b = |________|
=> 2 * |________| + 38 = 150
2 * |________| = 150-38=112
|________| = 112 : 2 = 56 = b
a = 56+38 = 94