Răspuns:
a)
a + b = 47
a - b = 23
________ +
2a / = 70 => a = 35 => b = 12
b)
a + b = 1 + rad3
a - b = 1 - rad3
____________ +
2a / = 2 => a = 1 => b = rad3
c)
a + b = 9 • 2^10
a - b = 7 • 2^10
____________ +
2a / = 2^10(9 + 7)
2a = 2^10 • 2^4
2a = 2^14 => a = 2^13
2^13 + b = 9 • 2^10
b = 9 • 2^10 - 2^13
b = 2^10(9 - 8)
b = 2^10